Deezer is the best thing for online music since Napster.
For the past week, I ignored Winamp or 1.fm entirely!

The concept is simple: free music on demand.

Like they put it:
"Our concept is simple:
-Give consumers a full and free access to all their favourite songs
-Pay artists and their producers through a revenue share based on our advertising revenues
- Help discovering new artists through a wide audience"

You can find both commercial mainstream and underground or indie artists. Search for them, or browse alphabetically, find the ones you like, then just click on play and listen. Simple, simple concept.

Its all free and legal, paying from advertisements. So click on some ads to support them.