Aspyr Media, in partnership with Activision, today announced that the third iteration of the popular Guitar Hero franchise, Guitar Hero III: Legends of Rock, will be available to PC and Mac gamers for the first time this fall. Being developed and published exclusively by Aspyr, the PC and Mac versions will match their console counterparts with new content and features including a multiplayer action-inspired battle mode, grueling boss battles, a host of exclusive unlockable content and “visually stunning” rock venues.