diff --git a/src/files/setup/setuprit.c b/src/files/setup/setuprit.c
index 4ebc336d2..2c89c8911 100644
--- a/src/files/setup/setuprit.c
+++ b/src/files/setup/setuprit.c
@@ -708,7 +708,7 @@ u8 func1006_hijack[] = {
 	endloop(0x04)
 
 	label(0x06)
-	cmd01da(0x35)
+	play_music_continuously(MUSIC_AIRFORCEONE_X)
 	set_chr_maxdamage(0x01, 10)
 	set_chr_maxdamage(0x04, 10)
 	set_chr_maxdamage(0x05, 10)
diff --git a/src/game/chr/chraicommands.c b/src/game/chr/chraicommands.c
index 035b4849f..3949de2c5 100644
--- a/src/game/chr/chraicommands.c
+++ b/src/game/chr/chraicommands.c
@@ -13886,8 +13886,8 @@ bool aiShowCutsceneChrs(void)
 
 	if (show) {
 		for (i = getNumChrs() - 1; i >= 0; i--) {
-			if (g_ChrsA[i].chrnum >= 0 && g_ChrsA[i].prop && (g_ChrsA[i].hidden2 & 1)) {
-				g_ChrsA[i].hidden2 &= ~1;
+			if (g_ChrsA[i].chrnum >= 0 && g_ChrsA[i].prop && (g_ChrsA[i].hidden2 & CHRH2FLAG_0001)) {
+				g_ChrsA[i].hidden2 &= ~CHRH2FLAG_0001;
 				g_ChrsA[i].chrflags &= ~CHRCFLAG_HIDDEN;
 			}
 		}
@@ -13895,7 +13895,7 @@ bool aiShowCutsceneChrs(void)
 		for (i = getNumChrs() - 1; i >= 0; i--) {
 			if (g_ChrsA[i].chrnum >= 0 && g_ChrsA[i].prop &&
 					(g_ChrsA[i].chrflags & (CHRCFLAG_UNPLAYABLE | CHRCFLAG_HIDDEN)) == 0) {
-				g_ChrsA[i].hidden2 |= 1;
+				g_ChrsA[i].hidden2 |= CHRH2FLAG_0001;
 				g_ChrsA[i].chrflags |= CHRCFLAG_HIDDEN;
 			}
 		}
@@ -14092,7 +14092,7 @@ glabel ai01d9
 /**
  * @cmd 01da
  */
-bool ai01da(void)
+bool aiPlayMusicContinuously(void)
 {
 	u8 *cmd = g_Vars.ailist + g_Vars.aioffset;
 	func0f16deb8(cmd[2]);
diff --git a/src/game/data/data_0083d0.c b/src/game/data/data_0083d0.c
index 95717828e..4987b91ed 100644
--- a/src/game/data/data_0083d0.c
+++ b/src/game/data/data_0083d0.c
@@ -6693,7 +6693,7 @@ bool (*g_CommandPointers[])(void) = {
 	/*0x01d7*/ aiIfDistanceToTarget2LessThan,
 	/*0x01d8*/ aiIfDistanceToTarget2GreaterThan,
 	/*0x01d9*/ ai01d9,
-	/*0x01da*/ ai01da,
+	/*0x01da*/ aiPlayMusicContinuously,
 	/*0x01db*/ aiChrKill,
 	/*0x01dc*/ aiRemoveWeaponFromInventory,
 	/*0x01dd*/ ai01dd,
diff --git a/src/include/commands.h b/src/include/commands.h
index a0808e582..8290e3288 100644
--- a/src/include/commands.h
+++ b/src/include/commands.h
@@ -3747,11 +3747,15 @@
 	0x00, \
 	u2,
 
-// Only called in AF1 with param 0x35.
-// Calls some functions and stores the value at 800840c8.
-#define cmd01da(u1) \
+/**
+ * Unsure exactly how this works. I think it replaces the main level theme with
+ * the one specified.
+ *
+ * Track is expected to be a MUSIC constant.
+ */
+#define play_music_continuously(track) \
 	mkshort(0x01da), \
-	u1,
+	track,
 
 /**
  * Kills the given chr.
diff --git a/src/include/constants.h b/src/include/constants.h
index 5d6c11212..16fc4053e 100644
--- a/src/include/constants.h
+++ b/src/include/constants.h
@@ -324,6 +324,9 @@
 #define CHRHFLAG_40000000           0x40000000 // Air Base and AF1
 #define CHRHFLAG_PSYCHOSISED        0x80000000
 
+// chr->hidden2
+#define CHRH2FLAG_0001 0x0001
+
 // chr->chrflags
 #define CHRCFLAG_00000001                    0x00000001 // Villa takers, Attack Ship Cass and skedar - both set at end of intros
 #define CHRCFLAG_00000002                    0x00000002 // Seems to be set on guards who can spawn clones?
diff --git a/src/include/game/chr/chraicommands.h b/src/include/game/chr/chraicommands.h
index 09eaf70e8..9b532c0b1 100644
--- a/src/include/game/chr/chraicommands.h
+++ b/src/include/game/chr/chraicommands.h
@@ -437,7 +437,7 @@
 /*0x01d7*/ bool aiIfDistanceToTarget2LessThan(void);
 /*0x01d8*/ bool aiIfDistanceToTarget2GreaterThan(void);
 /*0x01d9*/ bool ai01d9(void);
-/*0x01da*/ bool ai01da(void);
+/*0x01da*/ bool aiPlayMusicContinuously(void);
 /*0x01db*/ bool aiChrKill(void);
 /*0x01dc*/ bool aiRemoveWeaponFromInventory(void);
 /*0x01dd*/ bool ai01dd(void);