Phone has done this to me in the past, usually just had to hold power button for a bit and lights would flash and all would be good. Nothing this time around with volume buttons and power held multiple times. Seems strange it would brick while I was just listening to music. another note is I did lose 4g capabilities about a week ago. I hadn't gotten around to wiping to see if that fixed it.
Let me know what you guys think.
Edit: My phone is rooted and was running cyanogen mod 10.2 stable release