JamLegend.com

JamLegend enables features never before available in games like Guitar Hero and Rock Band. Enjoy a potentially unlimited song list through a new platform allowing artists to promote their music in an engaging way. JamLegend features massive online multiplayer for real-time showdowns between thousands of players, as well as turn based competition for dueling with a friend. Robust social features, leaderboards, real-time notifications, and social network integration round out the features list. Best of all, it's free.

http://www.jamlegend.com/

Edit by Robbie! (Forum Moderator) - Referral links are not allowed in threads, sorry!

Posted a trillion times.

No need for refferal link either now, you can just sign up.

o i did't see it posted, and o my bad