Swap 'n Drop (free)
I found this and it looked nice. Technically it's not a match 3 since you try to match 4 tiles. It's polished looking, though I haven't tried it yet. Whatever...
TA's resident ios rhythm game player
Former #1 Rhythm Control 2 Player (#2 now)
Unofficial #1 Gears Player (ignoring hackers)
Check out my Rhythm Game thread