http://www.amazon.com/dp/1413310567# this would be a start, but if you're running a lable there are probably more issues than this book covers. Google around. If you have the cash, seek out an experienced music lawyer for advice. Music law is definitely its own niche. I've been doing IP law for 10+ years, and when a music issue comes up I generally claim ignorance unless I'm pretty sure it turns only on general contract/copyright issues.