check these sites for labels...
http://www.copyright.gov/
http://www.uspto.gov/
ASCAP and BMI are very simple to understand. If you register with them, you make money...but there is a catch. You either have to start your own publishing company as well as become a published artist, or get under somebody else's publishing company....cause in order to have a song published, there must be a publishing company behind you!! If you get all that done, everytime somebody licenses your music, you get paid about $0.07....if you are under a different publishing company, say SUGE PUBLISHING for example, you will get paid about 3 1/2 cents everytime your shit is played. If you're gettin a shitload of radio play across the country, you will be makin some serious bread on the side....
for more info, please go to....
www.ascap.com
www.bmi.com