"ok"

core/src/mindustry/audio/SoundControl.java

@@ -76,6 +76,8 @@ public class SoundControl{
                 sound.setBus(uiBus);
             }
         }
+
+        Events.fire(new MusicRegisterEvent());
     }
 
     public void loop(Sound sound, float volume){

core/src/mindustry/game/EventType.java

@@ -70,6 +70,8 @@ public class EventType{
     public static class ContentInitEvent{}
     /** Called when the client game is first loaded. */
     public static class ClientLoadEvent{}
+    /** Called after SoundControl registers its music. */
+    public static class MusicRegisterEvent{}
     /** Called *after* all the modded files have been added into Vars.tree */
     public static class FileTreeInitEvent{}
     /** Called when a game begins and the world is loaded. */