About once a month iTunes offers a free sampler album of tunes. The current offering, indie Spotlight, is available until June 15. And if you haven't downloaded it already, you can still get the Songs from the House of Soul through april 30.
Fans can also download a free single song here every week. This week's offering: Outfit by Archie Bronson.
When I find free music, I tend to download it. It's a great way to build up your library, and a fun way to try out some new artists and styles. And what's there to lose? If you don't like anything you download, it doesn't take much to delete it.