I have not had this issue on previous versions. I just wanna know if anyone else is having the same issue?
Clear cache/dalvik and batterystats. Re-try. If the problem remains try reflashing the rom. I had it once on a previous build, but I solved it that way. You may even try another kernel.
I think this is related to this bug: http://miuiandroid.com/community/threads/music-player-high-cpu-usage.17312/