..lala.com..streamtrak.com..any comparison maybe in future.. LALA.COM allowed customers on any platform to preview songs in full, for free, and a "music match" capability that scanned your library and gave you full online access to your collection from any PC or Mac. It also sold music, http://www.zdnet.com/how-apple-used-its-money-and-muscle-to-kill-an-itunes-competitor-7000010029/