Guitar Hero: On Tour comes complete with an innovative button controller that plugs into the expansion port on the bottom of the DS Lite (I’m not sure if it works on the DS Phat yet). The game is controlled by turning the DS on its side, pressing the fret buttons and strumming on the DS bottom screen with an included guitar pick stylus. To keep your DS from flying out of your grip while you’re rockin’ out, the controller includes a sturdy guitar grip strap.

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Developed for Activision by Vicarious Visions, the pint-sized version of the game comes with about 25 “monster” tracks, and a variety of different gameplay modes. There’s also word that the DS’ microphone comes into play (presumably to activate “Star Power” mode) as well in some whimsical mini games. The game will also support multi-player gaming, with both co-op and competitive modes using the local wireless capabilities of the DS.

Priced at $49.99, including the controller, Guitar Hero: On Tour will ship on June 22, 2008, and can now be pre-ordered on Amazon. So what are you waiting for?