diff --git a/include/bgm.h b/include/bgm.h
index 4cd19c957a..c3ac3b1d10 100644
--- a/include/bgm.h
+++ b/include/bgm.h
@@ -3,4 +3,134 @@
 
 #define NA_BGM_STOP 0x100000FF
 
+#define NA_BGM_GENERAL_SFX 0x00             // General Sound Effects
+#define NA_BGM_NATURE_AMBIENCE 0x01         // Ambient background noises
+#define NA_BGM_TERMINA_FIELD 0x02           // Termina Field
+#define NA_BGM_CHASE 0x03                   // Forest Chase
+#define NA_BGM_MAJORAS_THEME 0x04           // Majora's Theme "STALKID"
+#define NA_BGM_CLOCK_TOWER 0x05             // The Clock Tower
+#define NA_BGM_STONE_TOWER_TEMPLE 0x06      // Stone Tower Temple
+#define NA_BGM_INV_STONE_TOWER_TEMPLE 0x07  // Stone Tower Temple Inverted
+#define NA_BGM_FAILURE_0 0x08               // Missed Event 1
+#define NA_BGM_FAILURE_1 0x09               // Title
+#define NA_BGM_HAPPY_MASK_SALESMAN 0x0A     // Mask Salesman "OMENYA"
+#define NA_BGM_SONG_OF_HEALING 0x0B         // Song of Healing "DEMO_CURE"
+#define NA_BGM_SWAMP_REGION 0x0C            // Southern Swamp and Woodfall "DAMP_AREA"
+#define NA_BGM_ALIEN_INVASION 0x0D          // Ghost Attack "UFO"
+#define NA_BGM_SWAMP_CRUISE 0x0E            // Mini Game "JUNGLE_CREWS"
+#define NA_BGM_SHARPS_CURSE 0x0F            // Sharp's Curse
+#define NA_BGM_GREAT_BAY_REGION 0x10        // Great Bay Coast "SEA_AREA"
+#define NA_BGM_IKANA_REGION 0x11            // Ikana Valley
+#define NA_BGM_DEKU_KING 0x12               // Court of the Deku King
+#define NA_BGM_MOUNTAIN_REGION 0x13         // Mountain Village "SNOW_AREA"
+#define NA_BGM_PIRATES_FORTRESS 0x14        // Pirates' Fortress "PIRATE_AREA"
+#define NA_BGM_CLOCK_TOWN_DAY_1 0x15        // Clock Town Day 1 This song's filename is dummied out in MM3D "DUMMY_21"
+#define NA_BGM_CLOCK_TOWN_DAY_2 0x16        // Clock Town Day 2 his song's filename is dummied out in MM3D "DUMMY_22"
+#define NA_BGM_CLOCK_TOWN_DAY_3 0x17        // Clock Town Day 3 This song's filename is dummied out in MM3D "DUMMY_23"
+#define NA_BGM_FILE_SELECT 0x18             // This song has no track name, as it's a duplicate of the Fairy's Fountain
+#define NA_BGM_CLEAR_EVENT 0x19             // Event Clear
+#define NA_BGM_ENEMY 0x1A                   // Battle
+#define NA_BGM_BOSS 0x1B                    // Boss Battle
+#define NA_BGM_WOODFALL_TEMPLE 0x1C         // Woodfall Temple "JUNGLE_DUNGEON"
+#define NA_BGM_MARKET 0x1D                  // Clock Town Day 1		Duplicate of #15. Interesting filename in MM3D.	✘
+#define NA_BGM_OPENING 0x1E                 // Forest Ambush
+#define NA_BGM_INSIDE_A_HOUSE 0x1F          // House "LINK_HOUSE"
+#define NA_BGM_GAME_OVER 0x20               // Game Over
+#define NA_BGM_CLEAR_BOSS 0x21              // Boss Clear
+#define NA_BGM_GET_ITEM 0x22                // Item Catch
+#define NA_BGM_GATE_OPEN 0x23               // Clock Town Day 2 Duplicate of #16. In MM3D, it shares its filename with the Door of Time song from OoT
+#define NA_BGM_GET_HEART 0x24               // Complete a Heart Piece
+#define NA_BGM_MINI_GAME_2 0x25             // Playing Minigame
+#define NA_BGM_GORON_RACE 0x26              // Goron Race
+#define NA_BGM_MUSIC_BOX_HOUSE 0x27         // Music Box House "ORGEL_HOUSE"
+#define NA_BGM_FAIRY_FOUNTAIN 0x28          // Fairy's Fountain In MM3D, it shares its filename with the Door of Time song from OoT "GODESS"
+#define NA_BGM_ZELDAS_LULLABY 0x29          // Zelda's Lullaby "HIME"
+#define NA_BGM_ROSA_SISTERS 0x2A            // Rosa Sisters' Dance "SISTER_DANCER"
+#define NA_BGM_OPEN_CHEST 0x2B              // Open Chest "OPEN_TRE_BOX"
+#define NA_BGM_MARINE_RESEARCH_LAB 0x2C     // Marine Research Laboratory "DRUGSTORE"
+#define NA_BGM_GIANTS_THEME 0x2D            // The Four Giants "KYOJIN_ROOM"
+#define NA_BGM_SONG_OF_STORMS 0x2E          // Guru-Guru's Song "FUSHA"
+#define NA_BGM_ROMANI_RANCH 0x2F            // Romani Ranch "RONRON"
+#define NA_BGM_GORON_VILLAGE 0x30           // Goron Village
+#define NA_BGM_MAYORS_OFFICE 0x31           // Mayor Dotour "MEETING"
+#define NA_BGM_OCA_EPONA 0x32               // Ocarina Epona's Song
+#define NA_BGM_OCA_SUNS 0x33                // Ocarina Sun's Song
+#define NA_BGM_OCA_TIME 0x34                // Ocarina Song of Time "TIME_NORMAL"
+#define NA_BGM_OCA_STORM 0x35               // Ocarina Song of Storms
+#define NA_BGM_ZORA_HALL 0x36               // Zora Hall
+#define NA_BGM_GET_NEW_MASK 0x37            // A New Mask
+#define NA_BGM_MINI_BOSS 0x38               // Mini Boss "MIDDLE_BOSS"
+#define NA_BGM_GET_SMALL_ITEM 0x39          // Small Item Catch "S_ITEM_GET"
+#define NA_BGM_ASTRAL_OBSERVATORY 0x3A      // Astral Observatory "TENMONDAI"
+#define NA_BGM_CAVERN 0x3B                  // Clock Town Cavern "NORMAL_DUNGEON"
+#define NA_BGM_MILK_BAR 0x3C                // Milk Bar Latte
+#define NA_BGM_ZELDA_APPEAR 0x3D            // Meet Zelda (OoT)
+#define NA_BGM_SARIAS_SONG 0x3E             // Saria's Theme Song from OoT "MAYOIMORI"
+#define NA_BGM_GORON_GOAL 0x3F              // Goron Race Goal
+#define NA_BGM_HORSE 0x40                   // Gorman Race
+#define NA_BGM_HORSE_GOAL 0x41              // Race Finish
+#define NA_BGM_INGO 0x42                    // Gorman Bros. "INGO"
+#define NA_BGM_KOTAKE_POTION_SHOP 0x43      // Kotake's Potion Shop "KOTAKE_KOUME"
+#define NA_BGM_SHOP 0x44                    // Store
+#define NA_BGM_OWL 0x45                     // Gaebora's Theme
+#define NA_BGM_MINI_GAME 0x46               // Target Practice
+#define NA_BGM_OCA_SOARING 0x47             // Ocarina Song of Soaring "OCA_BIGWING"
+#define NA_BGM_OCA_HEALING 0x48             // Ocarina Song of Healing "OCA_CURE"
+#define NA_BGM_INVERTED_SONG_OF_TIME 0x49   // Inverted Song of Time "_SPEED"
+#define NA_BGM_SONG_OF_DOUBLE_TIME 0x4A     // Song of Double Time "TIME_JUMP"
+#define NA_BGM_SONATA_OF_AWAKENING 0x4B     // Sonata of Awakening "DEMO_AWAKING"
+#define NA_BGM_GORON_LULLABY 0x4C           // Goron Lullaby "DEMO_LULLABY"
+#define NA_BGM_NEW_WAVE_BOSSA_NOVA 0x4D     // New Wave Bossa Nova "DEMO_TIDE"
+#define NA_BGM_ELEGY_OF_EMPTINESS 0x4E      // Elegy of Emptiness "DEMO_SHELL"
+#define NA_BGM_OATH_TO_ORDER 0x4F           // Oath to Order "DEMO_PLEDGE"
+#define NA_BGM_SWORD_TRAINING_HALL 0x50     // Sword Training "EXERCISE_HALL"
+#define NA_BGM_GORON_LULLABY_INTRO 0x51     // Ocarina Goron Lullaby Intro "DEMO_LULLABY_HALF"
+#define NA_BGM_OCA_FAIRY 0x52               // New Song "OCA_YOUSEI"
+#define NA_BGM_BREMEN_MARCH 0x53            // Bremen March "FACEMASK"
+#define NA_BGM_BALLAD_OF_THE_WIND_FISH 0x54 // Quartet performed in on the milk bar stage "QUARTET"
+#define NA_BGM_SONG_OF_SOARING 0x55         // Song of Soaring "WING_WARP"
+#define NA_BGM_MILK_BAR_DUPLICATE 0x56      // Milk Bar Latte		Duplicate. "MILK_BAR_DUMMY"
+#define NA_BGM_FINAL_HOURS 0x57             // Final Hours "TIME_LIMIT"
+#define NA_BGM_MIKAU_RIFF 0x58              // Mikau's Tale "MIKAU_LIFF"
+#define NA_BGM_MIKAU_FINALE 0x59            // A single guitar chord. "MIKAU_FIN"
+#define NA_BGM_FROG_SONG 0x5A               // Don Gero's Song
+#define NA_BGM_OCA_SONATA 0x5B              // Ocarina Sonata of Awakening "OCA_AWAKING"
+#define NA_BGM_OCA_LULLABY 0x5C             // Ocarina Goron Lullaby "OCA_LULLABY"
+#define NA_BGM_OCA_NEW_WAVE 0x5D            // Ocarina New Wave Bossa Nova "OCA_TIDE"
+#define NA_BGM_OCA_ELEGY 0x5E               // Ocarina Elegy of Emptiness "OCA_SHELL"
+#define NA_BGM_OCA_OATH 0x5F                // Ocarina Oath to Order "OCA_PLEDGE"
+#define NA_BGM_MAJORAS_LAIR 0x60            // "LAST_DUNGEON"
+#define NA_BGM_OCA_LULLABY_INTRO 0x61       // "OCA_LULLABY_HALF"
+#define NA_BGM_OCA_GUITAR_BASS_SESSION 0x62 // Bass and Guitar Session "OCA_SESSION"
+#define NA_BGM_PIANO_SESSION 0x63           // Piano Solo "DEMO_SESSION"
+#define NA_BGM_INDIGO_GO_SESSION 0x64       // The Indigo-Go's Rehearsal "ALLPART_SESSION"
+#define NA_BGM_SNOWHEAD_TEMPLE 0x65         // Snowhead Temple "SILVER_DUNGEON"
+#define NA_BGM_GREAT_BAY_TEMPLE 0x66        // Great Bay Temple "DEEPBLUE_DUNGEON"
+#define NA_BGM_NEW_WAVE_SAXOPHONE 0x67      // "DEMO_TIDE_SAX"
+#define NA_BGM_NEW_WAVE_VOCAL 0x68          // "DEMO_TIDE_VOCAL"
+#define NA_BGM_MAJORAS_WRATH 0x69           // Majora's Wrath "MUJURA_1"
+#define NA_BGM_MAJORAS_INCARNATION 0x6A     // Majora's Incarnation "MUJURA_2"
+#define NA_BGM_MAJORAS_MASK 0x6B            // Majora's Mask Battle "MUJURA_3"
+#define NA_BGM_BASS_PLAY 0x6C               // Bass Practice "BASS_PLAY"
+#define NA_BGM_DRUMS_PLAY 0x6D              // Drums Practice "DRUMS_PLAY"
+#define NA_BGM_PIANO_PLAY 0x6E              // Piano Practice "PIANO_PLAY"
+#define NA_BGM_IKANA_CASTLE 0x6F            // Ikana Castle
+#define NA_BGM_GATHERING_GIANTS 0x70        // Calling the Four Giants
+#define NA_BGM_KAMARO_DANCE 0x71            // Kamaro's Dance "CAMARO_DANCE"
+#define NA_BGM_CREMIA_CARRIAGE 0x72         // Cremia's Carriage "DONKEY_CART"
+#define NA_BGM_KEATON_QUIZ 0x73             // Keaton "QUIZ"
+#define NA_BGM_END_CREDITS_1 0x74           // The End/Credits I "END_DEMO"
+#define NA_BGM_OPENING_LOOP 0x75            // Forest Ambush (?)		Duplicate.
+#define NA_BGM_TITLE_THEME 0x76             // Title Screen
+#define NA_BGM_DUNGEON_APPEAR 0x77          // Surfacing of Woodfall
+#define NA_BGM_WOODFALL_CLEAR 0x78          // Woodfall Clear "PURIFICATION_0"
+#define NA_BGM_SNOWHEAD_CLEAR 0x79          // Snowhead Clear "PURIFICATION_1"
+#define NA_BGM_INTO_THE_MOON 0x7B           // To the Moon
+#define NA_BGM_GOODBYE_GIANT 0x7C           //
+#define NA_BGM_TATL_AND_TAEL 0x7D           // Tatl and Tael "CHAT"
+#define NA_BGM_MOONS_DESTRUCTION 0x7E       // Moon's Destruction "MOON_VANISH"
+#define NA_BGM_NO_MUSIC 0x7F                //
+#define NA_BGM_END_CREDITS_2 0x82           // The End/Credits II "STAFFROLL2"
+#define NA_BGM_DISABLED 0xFFFF
+
 #endif
diff --git a/include/functions.h b/include/functions.h
index f60c0326e7..2c64cc9cae 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -1757,7 +1757,7 @@ void func_800FD654(GlobalContext* globalCtx, Color_RGB8* pzParm2, f32 fParm3);
 // u32 get_days_elapsed(void);
 // void reset_days_elapsed(void);
 // u32 get_current_day(void);
-void func_800FD750(UNK_TYPE arg0);
+void func_800FD750(u16 seqId);
 // void func_800FD768(void);
 void func_800FD78C(GlobalContext* globalCtx);
 void func_800FD858(GlobalContext* globalCtx);
@@ -3872,7 +3872,7 @@ void func_8019FDC8(UNK_PTR arg0, u16 sfxId, UNK_TYPE arg2);
 void func_801A0124(Vec3f* pos, u8 arg1);
 // void func_801A0184(void);
 // void func_801A01C4(void);
-void func_801A0204(UNK_TYPE);
+void func_801A0204(s8 seqId);
 // void func_801A0238(void);
 // void func_801A026C(void);
 // void func_801A0318(void);
@@ -3893,10 +3893,10 @@ void func_801A0204(UNK_TYPE);
 // void func_801A1904(void);
 // void func_801A1A10(void);
 // void func_801A1A8C(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE4 param_5, UNK_TYPE4 param_6);
-void func_801A1D44(Vec3f* vec, UNK_TYPE arg1, f32 arg2);
-void func_801A1DB8(Vec3f* vec, UNK_TYPE arg1, f32 arg2);
+void func_801A1D44(Vec3f* vec, u8 seqId, f32 arg2);
+void func_801A1DB8(Vec3f* vec, u8 seqId, f32 arg2);
 // void func_801A1E0C(void);
-void func_801A1F00(s32 arg0, s32 arg1);
+void func_801A1F00(u8 arg0, u16 seqId);
 void func_801A1F88(void);
 // void func_801A1FB4(void);
 // void func_801A2090(void);
@@ -3909,20 +3909,20 @@ void func_801A246C(u8 param_1, u8 param_2);
 // void func_801A27E8(void);
 // void func_801A281C(void);
 void func_801A29D4(UNK_TYPE arg0, f32 arg1, UNK_TYPE arg2);
-void func_801A2BB8(s32 arg0);
+void func_801A2BB8(s32 seqId);
 void func_801A2C20(void);
 // void func_801A2C44(void);
 // void func_801A2C88(void);
 // void func_801A2D54(void);
-s32 func_801A2DE0(UNK_TYPE4 arg1);
+s32 Audio_IsSequencePlaying(u8 seqId);
 void func_801A2E54(s32 param_1);
 void func_801A2ED8(void);
 // void func_801A2F88(void);
 // void func_801A3000(void);
 // void func_801A3038(void);
-void func_801A3098(u16 arg0);
+void func_801A3098(u16 seqId);
 // void func_801A312C(void);
-void func_801A31EC(UNK_TYPE1 arg1, UNK_TYPE4 arg2, u8 arg3);
+void func_801A31EC(u16 seqId, s8 arg1, u8 arg2);
 // void func_801A3238(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE1 param_5);
 // void func_801A32CC(void);
 // void func_801A3590(void);
diff --git a/src/code/audio/code_8019AF00.c b/src/code/audio/code_8019AF00.c
index 227384d0aa..9354af1887 100644
--- a/src/code/audio/code_8019AF00.c
+++ b/src/code/audio/code_8019AF00.c
@@ -296,7 +296,7 @@
 
 #pragma GLOBAL_ASM("asm/non_matchings/code/code_8019AF00/func_801A2D54.s")
 
-#pragma GLOBAL_ASM("asm/non_matchings/code/code_8019AF00/func_801A2DE0.s")
+#pragma GLOBAL_ASM("asm/non_matchings/code/code_8019AF00/Audio_IsSequencePlaying.s")
 
 #pragma GLOBAL_ASM("asm/non_matchings/code/code_8019AF00/func_801A2E54.s")
 
diff --git a/src/code/z_common_data.c b/src/code/z_common_data.c
index 88fa3e1037..26fd324a73 100644
--- a/src/code/z_common_data.c
+++ b/src/code/z_common_data.c
@@ -5,9 +5,9 @@ SaveContext gSaveContext;
 void SaveContext_Init(void) {
     bzero(&gSaveContext, sizeof(gSaveContext));
     gSaveContext.playerForm = 0;
-    gSaveContext.seqIndex = 0xFF;
+    gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
     gSaveContext.nightSeqIndex = 0xFF;
-    gSaveContext.unk_3F46 = 0;
+    gSaveContext.unk_3F46 = NA_BGM_GENERAL_SFX;
     gSaveContext.nextCutsceneIndex = 0xFFEF;
     gSaveContext.cutsceneTrigger = 0;
     gSaveContext.unk_3F4D = 0;
diff --git a/src/code/z_game_over.c b/src/code/z_game_over.c
index c510c1974b..979b28cbaa 100644
--- a/src/code/z_game_over.c
+++ b/src/code/z_game_over.c
@@ -45,7 +45,7 @@ void GameOver_Update(GlobalContext* globalCtx) {
 
             gSaveContext.unk_3DC0 = 2000;
             gSaveContext.naviTimer = 0;
-            gSaveContext.seqIndex = 0xFF;
+            gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
             gSaveContext.nightSeqIndex = 0xFF;
             gSaveContext.eventInf[0] = 0;
             gSaveContext.eventInf[1] = 0;
@@ -66,7 +66,7 @@ void GameOver_Update(GlobalContext* globalCtx) {
             gameOverCtx->state = GAMEOVER_DEATH_WAIT_GROUND;
             break;
         case GAMEOVER_DEATH_FADE_OUT:
-            if (func_801A8A50(1) != 32) {
+            if (func_801A8A50(1) != NA_BGM_GAME_OVER) {
                 func_80169F78(globalCtx);
                 if (gSaveContext.respawnFlag != -7) {
                     gSaveContext.respawnFlag = -6;
diff --git a/src/code/z_scene.c b/src/code/z_scene.c
index dd158ac070..293a9762d9 100644
--- a/src/code/z_scene.c
+++ b/src/code/z_scene.c
@@ -449,7 +449,7 @@ void Scene_HeaderCmdSoundSettings(GlobalContext* globalCtx, SceneCmd* cmd) {
     globalCtx->soundCtx.seqIndex = cmd->soundSettings.musicSeq;
     globalCtx->soundCtx.nightSeqIndex = cmd->soundSettings.nighttimeSFX;
 
-    if (gSaveContext.seqIndex == 0xFF || func_801A8A50(0) == 0x57) {
+    if (gSaveContext.seqIndex == (u8)NA_BGM_DISABLED || func_801A8A50(0) == NA_BGM_FINAL_HOURS) {
         audio_setBGM(cmd->soundSettings.bgmId);
     }
 }
diff --git a/src/overlays/actors/ovl_Boss_02/z_boss_02.c b/src/overlays/actors/ovl_Boss_02/z_boss_02.c
index 6b3c944f4b..4984550114 100644
--- a/src/overlays/actors/ovl_Boss_02/z_boss_02.c
+++ b/src/overlays/actors/ovl_Boss_02/z_boss_02.c
@@ -1005,7 +1005,7 @@ void func_809DAB78(Boss02* this, GlobalContext* globalCtx) {
                     }
 
                     if (spB0->unk_0144 >= 10) {
-                        Audio_QueueSeqCmd(0x8021);
+                        Audio_QueueSeqCmd(NA_BGM_CLEAR_BOSS | 0x8000);
                     }
 
                     Audio_PlayActorSound2(&this->actor, NA_SE_EN_INBOSS_DEAD_OLD);
@@ -1342,7 +1342,7 @@ void func_809DC78C(Actor* thisx, GlobalContext* globalCtx) {
         if (D_809E0430 != 0) {
             D_809E0430--;
             if (D_809E0430 == 0) {
-                Audio_QueueSeqCmd(0x801B);
+                Audio_QueueSeqCmd(NA_BGM_BOSS | 0x8000);
             }
         }
     }
diff --git a/src/overlays/actors/ovl_En_Bigpo/z_en_bigpo.c b/src/overlays/actors/ovl_En_Bigpo/z_en_bigpo.c
index 42ac8d5108..b11647ddf6 100644
--- a/src/overlays/actors/ovl_En_Bigpo/z_en_bigpo.c
+++ b/src/overlays/actors/ovl_En_Bigpo/z_en_bigpo.c
@@ -449,7 +449,7 @@ void EnBigpo_SpawnCutsceneStage6(EnBigpo* this, GlobalContext* globalCtx) {
 void EnBigpo_SpawnCutsceneStage7(EnBigpo* this) {
     this->idleTimer = 15;
     if (this->unkBool204 == false) {
-        func_801A2E54(0x38);
+        func_801A2E54(NA_BGM_MINI_BOSS);
         this->unkBool204 = true;
     }
     this->actionFunc = EnBigpo_SpawnCutsceneStage8;
@@ -535,7 +535,7 @@ void EnBigpo_WarpingIn(EnBigpo* this, GlobalContext* globalCtx) {
     if (this->idleTimer == 32) {
         this->mainColor.a = 255; // fully visible
         if (this->unkBool204 == false) {
-            func_801A2E54(0x38);
+            func_801A2E54(NA_BGM_MINI_BOSS);
             this->unkBool204 = true;
         }
         EnBigpo_SetupIdleFlying(this);
diff --git a/src/overlays/actors/ovl_En_Dinofos/z_en_dinofos.c b/src/overlays/actors/ovl_En_Dinofos/z_en_dinofos.c
index a73f5423ff..bf0f977b74 100644
--- a/src/overlays/actors/ovl_En_Dinofos/z_en_dinofos.c
+++ b/src/overlays/actors/ovl_En_Dinofos/z_en_dinofos.c
@@ -528,7 +528,7 @@ void func_8089B3D4(EnDinofos* this, GlobalContext* globalCtx) {
     Math_Vec3f_StepTo(&camera->eye, &this->unk_2BC, 10.0f);
     this->unk_290++;
     if (this->unk_290 == 10) {
-        func_801A2E54(0x38);
+        func_801A2E54(NA_BGM_MINI_BOSS);
     }
 
     sp28.x = this->actor.world.pos.x;
@@ -547,7 +547,7 @@ void func_8089B3D4(EnDinofos* this, GlobalContext* globalCtx) {
 
 void func_8089B4A4(EnDinofos* this) {
     if (this->unk_290 < 10) {
-        func_801A2E54(0x38);
+        func_801A2E54(NA_BGM_MINI_BOSS);
     }
     Animation_PlayOnce(&this->skelAnime, &D_0600C974);
     this->unk_2BC.x = (Math_SinS(this->actor.shape.rot.y + 0x200) * 123.0f) + this->actor.world.pos.x;
diff --git a/src/overlays/actors/ovl_En_Elforg/z_en_elforg.c b/src/overlays/actors/ovl_En_Elforg/z_en_elforg.c
index 644f2fedb4..1efecd2574 100644
--- a/src/overlays/actors/ovl_En_Elforg/z_en_elforg.c
+++ b/src/overlays/actors/ovl_En_Elforg/z_en_elforg.c
@@ -464,7 +464,7 @@ void EnElforg_FreeFloating(EnElforg* this, GlobalContext* globalCtx) {
                 gSaveContext.inventory.strayFairies[gSaveContext.unk_48C8]++;
                 func_801518B0(globalCtx, 0x11, NULL);
                 if (gSaveContext.inventory.strayFairies[(void)0, gSaveContext.unk_48C8] >= 15) {
-                    func_801A3098(0x922);
+                    func_801A3098(NA_BGM_GET_ITEM | 0x900);
                 }
             }
         }
diff --git a/src/overlays/actors/ovl_En_Fu/z_en_fu.c b/src/overlays/actors/ovl_En_Fu/z_en_fu.c
index 737c142bff..a898ea7cc2 100644
--- a/src/overlays/actors/ovl_En_Fu/z_en_fu.c
+++ b/src/overlays/actors/ovl_En_Fu/z_en_fu.c
@@ -543,7 +543,7 @@ void func_80962660(EnFu* this, GlobalContext* globalCtx) {
                 player->stateFlags1 |= 0x20;
                 this->unk_53C = 0;
                 func_800BDC5C(&this->skelAnime, sAnimations, 3);
-                func_801A2BB8(0x25);
+                func_801A2BB8(NA_BGM_MINI_GAME_2);
                 if (this->unk_542 == 0) {
                     if (this->unk_546 == 1) {
                         func_80961EC8(globalCtx);
@@ -805,7 +805,7 @@ void func_80962F4C(EnFu* this, GlobalContext* globalCtx) {
             func_801A2C20();
             gSaveContext.unk_3DE0[4] = 0;
             gSaveContext.unk_3DD0[4] = 5;
-            func_801A3098(0x922);
+            func_801A3098(NA_BGM_GET_ITEM | 0x900);
             func_8011B4E0(globalCtx, 1);
             this->unk_54A = 3;
             func_809632D0(this);
diff --git a/src/overlays/actors/ovl_En_Guruguru/z_en_guruguru.c b/src/overlays/actors/ovl_En_Guruguru/z_en_guruguru.c
index 71e0c8cd0b..14a2ac839e 100644
--- a/src/overlays/actors/ovl_En_Guruguru/z_en_guruguru.c
+++ b/src/overlays/actors/ovl_En_Guruguru/z_en_guruguru.c
@@ -339,12 +339,12 @@ void EnGuruguru_Update(Actor* thisx, GlobalContext* globalCtx) {
 
     if (this->actor.params == 2) {
         if (fabsf(player->actor.world.pos.y - this->actor.world.pos.y) < 100.0f) {
-            func_801A1DB8(&this->actor.projectedPos, 0x2E, 540.0f);
+            func_801A1DB8(&this->actor.projectedPos, NA_BGM_SONG_OF_STORMS, 540.0f);
         }
         return;
     }
     if (fabsf(player->actor.world.pos.y - this->actor.world.pos.y) < 200.0f) {
-        func_801A1D44(&this->actor.projectedPos, 0x2E, 540.0f);
+        func_801A1D44(&this->actor.projectedPos, NA_BGM_SONG_OF_STORMS, 540.0f);
     }
     if (this->unusedTimer != 0) {
         this->unusedTimer--;
diff --git a/src/overlays/actors/ovl_En_In/z_en_in.c b/src/overlays/actors/ovl_En_In/z_en_in.c
index 194780688e..b69ba8bf16 100644
--- a/src/overlays/actors/ovl_En_In/z_en_in.c
+++ b/src/overlays/actors/ovl_En_In/z_en_in.c
@@ -860,7 +860,7 @@ s32 func_808F4414(GlobalContext* globalCtx, EnIn* this, s32 arg2) {
                     break;
                 case 0x3475:
                     SET_FLAGS_START_RACE;
-                    func_800FD750(0x40);
+                    func_800FD750(NA_BGM_HORSE);
                     globalCtx->nextEntranceIndex = 0xCE50;
                     globalCtx->unk_1887F = 5;
                     globalCtx->sceneLoadFlag = 0x14;
@@ -1107,7 +1107,7 @@ s32 func_808F4414(GlobalContext* globalCtx, EnIn* this, s32 arg2) {
                     break;
                 case 0x3475:
                     SET_FLAGS_START_RACE;
-                    func_800FD750(0x40);
+                    func_800FD750(NA_BGM_HORSE);
                     globalCtx->nextEntranceIndex = 0xCE50;
                     globalCtx->unk_1887F = 5;
                     globalCtx->sceneLoadFlag = 0x14;
diff --git a/src/overlays/actors/ovl_En_Invadepoh/z_en_invadepoh.c b/src/overlays/actors/ovl_En_Invadepoh/z_en_invadepoh.c
index 42b9a6c91e..b10894b16e 100644
--- a/src/overlays/actors/ovl_En_Invadepoh/z_en_invadepoh.c
+++ b/src/overlays/actors/ovl_En_Invadepoh/z_en_invadepoh.c
@@ -1699,7 +1699,7 @@ void func_80B4627C(EnInvadepoh* this, GlobalContext* globalCtx) {
         } else {
             func_80B454BC(this, globalCtx);
             func_80B452EC(this, globalCtx);
-            Audio_QueueSeqCmd(0x800D);
+            Audio_QueueSeqCmd(NA_BGM_ALIEN_INVASION | 0x8000);
             func_80B46F88(this);
         }
     } else if (D_80B4E940 == 3) {
@@ -1987,7 +1987,7 @@ void func_80B46EE8(EnInvadepoh* this, GlobalContext* globalCtx) {
     this->actionTimer--;
     if (this->actionTimer <= 0) {
         ActorCutscene_Stop(D_80B50404[0]);
-        Audio_QueueSeqCmd(0x800D);
+        Audio_QueueSeqCmd(NA_BGM_ALIEN_INVASION | 0x8000);
         func_80B46F88(this);
     }
 }
@@ -2036,7 +2036,7 @@ void func_80B470E0(EnInvadepoh* this) {
 
 void func_80B47108(EnInvadepoh* this, GlobalContext* globalCtx) {
     if (this->actionTimer == 100) {
-        func_801A3098(0x19);
+        func_801A3098(NA_BGM_CLEAR_EVENT);
     }
     this->actionTimer--;
     if (this->actionTimer <= 0) {
diff --git a/src/overlays/actors/ovl_En_Kakasi/z_en_kakasi.c b/src/overlays/actors/ovl_En_Kakasi/z_en_kakasi.c
index 436386af91..631fc26e59 100644
--- a/src/overlays/actors/ovl_En_Kakasi/z_en_kakasi.c
+++ b/src/overlays/actors/ovl_En_Kakasi/z_en_kakasi.c
@@ -811,7 +811,7 @@ void EnKakasi_DancingRemark(EnKakasi* this, GlobalContext* globalCtx) {
         if (currentDay == 3 && gSaveContext.isNight) {
             EnKakasi_SetupDigAway(this);
         } else {
-            func_801A2BB8(0x3E);
+            func_801A2BB8(NA_BGM_SARIAS_SONG);
             EnKakasi_SetupDanceNightAway(this);
         }
     }
diff --git a/src/overlays/actors/ovl_En_Ma4/z_en_ma4.c b/src/overlays/actors/ovl_En_Ma4/z_en_ma4.c
index eca46a8e85..92908ac6d9 100644
--- a/src/overlays/actors/ovl_En_Ma4/z_en_ma4.c
+++ b/src/overlays/actors/ovl_En_Ma4/z_en_ma4.c
@@ -751,7 +751,7 @@ void EnMa4_SetupHorsebackGameEnd(EnMa4* this, GlobalContext* globalCtx) {
     gSaveContext.weekEventReg[0x8] &= (u8)~0x01;
     this->actionFunc = EnMa4_HorsebackGameEnd;
     Audio_QueueSeqCmd(NA_BGM_STOP);
-    Audio_QueueSeqCmd(0x8041);
+    Audio_QueueSeqCmd(NA_BGM_HORSE_GOAL | 0x8000);
 }
 
 void EnMa4_HorsebackGameEnd(EnMa4* this, GlobalContext* globalCtx) {
diff --git a/src/overlays/actors/ovl_En_Ma_Yto/z_en_ma_yto.c b/src/overlays/actors/ovl_En_Ma_Yto/z_en_ma_yto.c
index 4c955f83fb..d89ed45821 100644
--- a/src/overlays/actors/ovl_En_Ma_Yto/z_en_ma_yto.c
+++ b/src/overlays/actors/ovl_En_Ma_Yto/z_en_ma_yto.c
@@ -903,7 +903,7 @@ void EnMaYto_SetupAfterMilkRunInit(EnMaYto* this) {
     if (gSaveContext.weekEventReg[0x34] & 1) { // if (ProtectedCremia)
         EnMaYto_SetFaceExpression(this, 3, 1);
     } else {
-        func_801A3098(9);
+        func_801A3098(NA_BGM_FAILURE_1);
         EnMaYto_SetFaceExpression(this, 5, 2);
     }
     this->actionFunc = EnMaYto_AfterMilkRunInit;
diff --git a/src/overlays/actors/ovl_En_Minifrog/z_en_minifrog.c b/src/overlays/actors/ovl_En_Minifrog/z_en_minifrog.c
index 67c1d86593..9095d702b3 100644
--- a/src/overlays/actors/ovl_En_Minifrog/z_en_minifrog.c
+++ b/src/overlays/actors/ovl_En_Minifrog/z_en_minifrog.c
@@ -462,7 +462,7 @@ void EnMinifrog_BeginChoirCutscene(EnMinifrog* this, GlobalContext* globalCtx) {
         ActorCutscene_Start(this->actor.cutscene, &this->actor);
         this->actionFunc = EnMinifrog_SetupNextFrogChoir;
         this->timer = 5;
-        func_801A1F00(3, 0x5A);
+        func_801A1F00(3, NA_BGM_FROG_SONG);
         this->flags |= 0x100;
         globalCtx->setPlayerTalkAnim(globalCtx, &D_0400E2A8, 0);
     } else {
diff --git a/src/overlays/actors/ovl_En_Owl/z_en_owl.c b/src/overlays/actors/ovl_En_Owl/z_en_owl.c
index 446b4c100e..514245a327 100644
--- a/src/overlays/actors/ovl_En_Owl/z_en_owl.c
+++ b/src/overlays/actors/ovl_En_Owl/z_en_owl.c
@@ -367,7 +367,7 @@ void func_8095AE60(EnOwl* this, GlobalContext* globalCtx) {
 void func_8095AEC0(EnOwl* this, GlobalContext* globalCtx) {
     func_8095A920(this, globalCtx);
     if (func_8095A978(this, globalCtx, 0x7D0, 360.0f, 200.0f)) {
-        func_801A3098(0x45);
+        func_801A3098(NA_BGM_OWL);
         this->actionFunc = func_8095AE60;
     }
 }
@@ -396,7 +396,7 @@ void func_8095AF2C(EnOwl* this, GlobalContext* globalCtx) {
 void func_8095AFEC(EnOwl* this, GlobalContext* globalCtx) {
     func_8095A920(this, globalCtx);
     if (func_8095A978(this, globalCtx, 0xBF6, 200.0f, 100.0f)) {
-        func_801A3098(0x45);
+        func_801A3098(NA_BGM_OWL);
         this->actionFunc = func_8095AF2C;
         this->unk_406 = 0;
         this->actionFlags |= 0x40;
@@ -511,7 +511,7 @@ void func_8095B574(EnOwl* this, GlobalContext* globalCtx) {
     func_8095A920(this, globalCtx);
     if (func_800B84D0(&this->actor, globalCtx)) {
         this->actionFunc = func_8095BA84;
-        func_801A3098(0x45);
+        func_801A3098(NA_BGM_OWL);
         this->actionFlags |= 0x40;
         this->unk_406 = 2;
     } else if (this->actor.xzDistToPlayer < 200.0f) {
@@ -721,7 +721,7 @@ void func_8095BE0C(EnOwl* this, GlobalContext* globalCtx) {
     func_8095A920(this, globalCtx);
     if (func_800B84D0(&this->actor, globalCtx)) {
         this->actionFunc = func_8095BA84;
-        func_801A3098(0x45);
+        func_801A3098(NA_BGM_OWL);
         this->unk_406 = 1;
         this->actionFlags |= 0x40;
     } else if (this->actor.textId == 0xBF0) {
diff --git a/src/overlays/actors/ovl_En_Pamera/z_en_pamera.c b/src/overlays/actors/ovl_En_Pamera/z_en_pamera.c
index db3f66030e..129b1c94d5 100644
--- a/src/overlays/actors/ovl_En_Pamera/z_en_pamera.c
+++ b/src/overlays/actors/ovl_En_Pamera/z_en_pamera.c
@@ -590,9 +590,9 @@ void func_80BD9840(EnPamera* this, GlobalContext* globalCtx) {
         func_80BD9904(this);
     }
     if (gSaveContext.weekEventReg[14] & 4) {
-        func_801A0204(0x27);
+        func_801A0204(NA_BGM_MUSIC_BOX_HOUSE);
     } else {
-        func_801A0204(0x1F);
+        func_801A0204(NA_BGM_INSIDE_A_HOUSE);
     }
 }
 
diff --git a/src/overlays/actors/ovl_En_Pametfrog/z_en_pametfrog.c b/src/overlays/actors/ovl_En_Pametfrog/z_en_pametfrog.c
index 12e234991a..8acba6f8ab 100644
--- a/src/overlays/actors/ovl_En_Pametfrog/z_en_pametfrog.c
+++ b/src/overlays/actors/ovl_En_Pametfrog/z_en_pametfrog.c
@@ -1054,7 +1054,7 @@ void EnPametfrog_LookAround(EnPametfrog* this, GlobalContext* globalCtx) {
     this->actor.shape.rot.y = this->actor.world.rot.y;
     if (SkelAnime_Update(&this->skelAnime) && (func_801690CC(globalCtx) == 0)) {
         if (!this->unk_2AE) {
-            func_801A2E54(0x38);
+            func_801A2E54(NA_BGM_MINI_BOSS);
             this->unk_2AE = true;
         }
         EnPametfrog_SetupJumpToLink(this);
@@ -1274,7 +1274,7 @@ void EnPametfrog_SetupTransitionGekkoSnapper(EnPametfrog* this, GlobalContext* g
 
 void EnPametfrog_TransitionGekkoSnapper(EnPametfrog* this, GlobalContext* globalCtx) {
     if (this->actor.params == GEKKO_INIT_SNAPPER) {
-        func_801A2E54(0x38);
+        func_801A2E54(NA_BGM_MINI_BOSS);
         EnPametfrog_SetupRunToSnapper(this);
     }
 }
diff --git a/src/overlays/actors/ovl_En_Suttari/z_en_suttari.c b/src/overlays/actors/ovl_En_Suttari/z_en_suttari.c
index fcf86fdcd2..de55cbbcaf 100644
--- a/src/overlays/actors/ovl_En_Suttari/z_en_suttari.c
+++ b/src/overlays/actors/ovl_En_Suttari/z_en_suttari.c
@@ -1139,7 +1139,7 @@ void func_80BAD230(EnSuttari* this, GlobalContext* globalCtx) {
         this->textId = 0x2A31;
         func_801518B0(globalCtx, this->textId, &this->actor);
         this->flags1 |= 0x4000;
-        Audio_QueueSeqCmd(0x8003);
+        Audio_QueueSeqCmd(NA_BGM_CHASE | 0x8000);
         this->actionFunc = func_80BAD380;
     } else {
         ActorCutscene_SetIntentToPlay(this->cutscenes[1]);
diff --git a/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c b/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c
index 5018c640fd..5137628056 100644
--- a/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c
+++ b/src/overlays/actors/ovl_En_Syateki_Man/z_en_syateki_man.c
@@ -337,7 +337,7 @@ void func_809C6C2C(EnSyatekiMan* this, GlobalContext* globalCtx) {
                 func_80123F2C(globalCtx, 80);
                 this->unk_26A = 1;
                 this->actionFunc = func_809C80C0;
-                func_801A2BB8(0x25);
+                func_801A2BB8(NA_BGM_MINI_GAME_2);
                 break;
 
             case 0xA32:
@@ -657,7 +657,7 @@ void func_809C7620(EnSyatekiMan* this, GlobalContext* globalCtx) {
                 func_80112AFC(globalCtx);
                 func_80123F2C(globalCtx, 0x63);
                 this->unk_26A = 1;
-                func_801A2BB8(0x25);
+                func_801A2BB8(NA_BGM_MINI_GAME_2);
                 this->actionFunc = func_809C8808;
                 break;
 
@@ -1160,7 +1160,7 @@ void func_809C898C(EnSyatekiMan* this, GlobalContext* globalCtx) {
             func_801A2C20();
             this->actionFunc = func_809C8BF0;
             if (this->unk_280 == 50) {
-                func_801A3098(0x922);
+                func_801A3098(NA_BGM_GET_ITEM | 0x900);
                 func_8011B4E0(globalCtx, 1);
             }
         }
diff --git a/src/overlays/actors/ovl_En_Toto/z_en_toto.c b/src/overlays/actors/ovl_En_Toto/z_en_toto.c
index ef3fdf7dcf..0acdc04856 100644
--- a/src/overlays/actors/ovl_En_Toto/z_en_toto.c
+++ b/src/overlays/actors/ovl_En_Toto/z_en_toto.c
@@ -612,7 +612,7 @@ s32 func_80BA47E0(EnToto* this, GlobalContext* globalCtx) {
 
 s32 func_80BA49A4(EnToto* this, GlobalContext* globalCtx) {
     func_800B7298(globalCtx, NULL, 0x44);
-    func_801A31EC(0x54, 4, this->unk2B3 ^ 0xF);
+    func_801A31EC(NA_BGM_BALLAD_OF_THE_WIND_FISH, 4, this->unk2B3 ^ 0xF);
     this->unk2B1 = 4;
     return 0;
 }
@@ -621,8 +621,8 @@ s32 func_80BA4A00(EnToto* this, GlobalContext* globalCtx) {
     Actor* actor;
 
     if (DECR(this->unk2B1) == 0) {
-        if (!func_801A2DE0(0x54)) {
-            actor = (Actor*)GET_PLAYER(globalCtx); // Needed for regalloc, possible FAKE MATCH
+        if (!Audio_IsSequencePlaying(NA_BGM_BALLAD_OF_THE_WIND_FISH)) {
+            actor = &GET_PLAYER(globalCtx)->actor;
             actor = actor->next;
             while (actor != NULL) {
                 Actor_MarkForDeath(actor);
diff --git a/src/overlays/gamestates/ovl_select/z_select.c b/src/overlays/gamestates/ovl_select/z_select.c
index 550bbbc8e0..1cae35a850 100644
--- a/src/overlays/gamestates/ovl_select/z_select.c
+++ b/src/overlays/gamestates/ovl_select/z_select.c
@@ -45,7 +45,7 @@ void Select_LoadGame(SelectContext* this, u32 entranceIndex, s32 opt) {
     }
 
     gSaveContext.respawn[0].entranceIndex = 0xFFFF;
-    gSaveContext.seqIndex = 0xFF;
+    gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
     gSaveContext.nightSeqIndex = 0xFF;
     gSaveContext.showTitleCard = true;
     gSaveContext.respawnFlag = 0;
diff --git a/src/overlays/gamestates/ovl_title/z_title.c b/src/overlays/gamestates/ovl_title/z_title.c
index ed732fc3db..62a85c8633 100644
--- a/src/overlays/gamestates/ovl_title/z_title.c
+++ b/src/overlays/gamestates/ovl_title/z_title.c
@@ -127,7 +127,7 @@ void Title_Main(GameState* thisx) {
     Title_UpdateCounters(this);
     Title_Draw(&this->gameState);
     if (this->exit) {
-        gSaveContext.seqIndex = 0xFF;
+        gSaveContext.seqIndex = (u8)NA_BGM_DISABLED;
         gSaveContext.nightSeqIndex = 0xFF;
         gSaveContext.gameMode = 1;
 
diff --git a/tools/disasm/functions.txt b/tools/disasm/functions.txt
index 6eabbe56dd..dda5c667f6 100644
--- a/tools/disasm/functions.txt
+++ b/tools/disasm/functions.txt
@@ -3951,7 +3951,7 @@
     0x801A2C44:("func_801A2C44",),
     0x801A2C88:("func_801A2C88",),
     0x801A2D54:("func_801A2D54",),
-    0x801A2DE0:("func_801A2DE0",),
+    0x801A2DE0:("Audio_IsSequencePlaying",),
     0x801A2E54:("func_801A2E54",),
     0x801A2ED8:("func_801A2ED8",),
     0x801A2F88:("func_801A2F88",),
diff --git a/tools/sizes/code_functions.csv b/tools/sizes/code_functions.csv
index 681b1cd4ee..fba05738ec 100644
--- a/tools/sizes/code_functions.csv
+++ b/tools/sizes/code_functions.csv
@@ -3469,7 +3469,7 @@ asm/non_matchings/code/code_8019AF00/func_801A2C20.s,func_801A2C20,0x801A2C20,0x
 asm/non_matchings/code/code_8019AF00/func_801A2C44.s,func_801A2C44,0x801A2C44,0x11
 asm/non_matchings/code/code_8019AF00/func_801A2C88.s,func_801A2C88,0x801A2C88,0x33
 asm/non_matchings/code/code_8019AF00/func_801A2D54.s,func_801A2D54,0x801A2D54,0x23
-asm/non_matchings/code/code_8019AF00/func_801A2DE0.s,func_801A2DE0,0x801A2DE0,0x1D
+asm/non_matchings/code/code_8019AF00/Audio_IsSequencePlaying.s,Audio_IsSequencePlaying,0x801A2DE0,0x1D
 asm/non_matchings/code/code_8019AF00/func_801A2E54.s,func_801A2E54,0x801A2E54,0x21
 asm/non_matchings/code/code_8019AF00/func_801A2ED8.s,func_801A2ED8,0x801A2ED8,0x2C
 asm/non_matchings/code/code_8019AF00/func_801A2F88.s,func_801A2F88,0x801A2F88,0xF