Acclaim has decided that they didnt want to battle Guitar Hero and Rock Band and instead have launched an online music game called Rockfree. Players can battle it out with up to seven other people over the internet, and it”ll feature licensed tracks including Iron Man, Fat Lip, and Woman. A closed beta kicked off this weekend, with a full launch scheduled for the first quarter of next year.

WMG, Sony and EMI are on board for licensing – which indicates that Acclaim is ponying up a decent amount of cash for song rights, since WMG is apparently playing hardball on this score with games publishers right now.

Currently, the game is free to play so it is going to be very interesting to see if Acclaim will make money from advertising, or even push though affiliate sales to iTunes and Amazon. All I know is that this is a very interesting idea and it is good to see that Acclaim is moving away from just being a console publisher and now turning into a real games publisher.