Over 350,000 units sold in three weeks … on a handheld? Youbetter believe Activision is already booking a second tour and they’re it’s called: Guitar Hero: On Tour Decades. The sequel to last month’s palm-packed jam session was confirmed today during the Nintendo E3 2008 keynote. While not detailed, Decades will likely include a setlist that ranges multiple … decades. The game will also include a song-sharing feature, allowing those with only the original On Tour to sample the Decades tracks. And apparently, there could be some form of microphone functionality for a possible karaoke feature?