Interested in acquiring some great and free (gratuity accepted) music to download? This is your chance. The Free Music Archive is up and running, with about 5000 tracks available for streaming or download in its library. All of the songs are licensed under Creative Commons, and the selection itself is carefully maintained by cred-heavy organizations like WFMU, KEXP, dublab, and ISSUE Project Room.
Much like open-source sampling sites, FMA does not restrict the use of any of its music-- chop, remix, and soundtrack as you see fit. Also, the site maintains bios of featured artists and accepts tips via PayPal.
I must say the a lot of this stuff is right up my completist tendency alley. There’s a lot of live radio broadcast-type stuff up right now, but most of it seems to be of pretty high quality, and recognizable, too.
Take the time to search it out. You might just find some downloadable treasures.