You can hear them on Last.fm and if you like it you can download them and hear it again as often as you like. Many upcoming artists (but also established chart climbers) promote themselves by offering some of their recordings (temporarily) free of charge here at Last.fm either full songs, samples or remixes.

Use this tag to mark the finest tracks you heard so that others can enjoy them too.

Rather tag individual tracks than the artist or the album, also un-tag them once the track is no longer offered as a free download.

Please note there is big a difference between download free of charge and Free Music regarding the copyright on it, for those there is another tag in use: Free Music.