i would just see if you have a school choir nearby, like someone else suggested. i bet they wouldn't mind if you asked to tape them warming up.

hey all. i've been making music over at splicemusic.com for a little while now. it sounds a lot like this, but splice lets you play on there without having an account. you just have to sign up if you want to save stuff. they have a lot of cool toys on there, though... like, you can mix your stuff in...