If you are in the US, most licensing is done through the Harry Fox Agency (www.songfile.com). Search for the song, and if there, you pay with credit card. It has been a year since I checked but then it was 8 cents/song times the number of cd's being made (there was a minimum I believe - maybe 500). The price is different if the song is over 5 minutes. If the songs are not there, you will have to do some internet digging to track down the owner of the publishing rights. Good luck.

dw