"Similiar to Seeqpod and Songza, Just Hear It offers registered and unregistered users alike a seamless interface for song search and playlist creation, all from within the browser. Just Hear It claims to be completely legal, following DMCA guidelines, and paying royalties to all of the major performing-rights organizations, like ASCAP, BMI, and SESAC. In the future, Just Hear It aims to negotiate licenses to share revenue with labels. Currently, much of the music actually seems to come from YouTubeYouTube reviewsYouTube reviews - much like another site we recently reviewed, StreamDrag." - Mashable
Any music. Legal. Free. Finds YouTube videos and other online music.