AOL's website offers a pretty impressive amount of free music. The only caveat is that the music has to be streamed, and not downloaded. The plus side, its all pretty well organized, so you can pick a song you'd like to stream.

There's definitely a focus on the more popular music of today, with the "Top 100" songs placed prominently on their front page. If you dig deeper, you can find their "Music Archive" which is a great resource for a lot of content. The audio files and the video files are all mixed together. Most of the video files include "AOL Sessions" where some band apparently filmed a special session just to put on this site (or stream to AOL users live at the time). Overall a good site.

Site:AOL Music / More Info