I use it for things that need to loop constantly without a relay. This fit two criteria:
You still haven't said what it's used for (assuming you're not using it for actually playing music, in that case, refer to my previous post).
-2x Range Bricks = Loud Reach
Irrelevant if it's purely for looping.
-Loop w/o Relay
Last time I checked there wasn't some onMusicLoop event.