If you don't think you'll be able to break away from Guitar Hero long enough to check out Wii Music this October, but like the idea of seeing your Mii rock out on guitar then you, my friend, are in luck. The Wii version of the upcoming Guitar Hero World Tour will have a special game exclusive to Wii players called "Mii Freestyle" that lets you jam with a friend, and see your Mii playing along on screen.
Similar to the game's Music Studio mode, Mii Freestyle lets you pick and choose the notes you play (hence the whole freestyle concept), and you can even jam with the Nunchuck and Wiimote air-guitar style. Yes, you heard me, air guitar. I better get my game face on, stat!