I've bought and activated music for my tori, but how do I use it?

music i think not working.
if you want to play starter music you must have Kiai sound, that is 2k in shop or lower in market

^that guy is wrong, the music item is working.

u just have to upload your own tracks to it.
http://forum.toribash.com/showthread.php?t=389324
here is a tutorial which should help u to upload your tracks,
also ive got a list of commands on how to use it afterwards:
New ingame music:
/music status - info about current playlist/track
/music queue - list tracks in queue
/music list username - list custom/username tracks
/music normal|repeat|random - control what track is played next
/music play custom/tori/track1.ogg - play a specific track
/music play tori - play all tracks from custom/tori
/music volume [0-128] - set music volume
/music start|stop|pause|resume|next|prev