Qtrax 

Qtrax is the world's first free and legal peer-to-peer (P2P) digital music site. Music lovers can discover new music and legally download full-length, high-quality versions of their favorite songs while compensating both the artists and the record labels through non-intrusive and relevant advertising. Qtrax has the unparalleled support of the major record labels and all of their respective publishing divisions. LTDnetwork Inc, a division of Brilliant Technologies Corporation, developed Qtrax and its components.