We didn't see this one coming. Soon, you'll be able to shred from anywhere with Guitar Hero: On Tour for Nintendo DS. Using the included Guitar Hero Guitar Grip and pick-stylus, DS owners will be able to rock out to a huge list of tracks, including classic rock, alternative and pop favorites like Nirvana, OK Go and No Doubt. Guitar Hero: On Tour also features a Wi-Fi co-op mode and a Guitar Duel option. The game will be released "this summer".