"No one asked Vicarious Visions to make Guitar Hero for the Nintendo DS. No one at studio owner Activision, fellow Activision subsidiary RedOctane, or Nintendo believed it was even possible.

"People thought it was ludicrous," Vicarious CEO Karthik Bala told me at a Guitar Hero event earlier this week. "It was never in the plan to do that."

As Bala puts it, the whole thing came out of the Vicarious staff playing around to "see if it was even possible to do a really good music rhythm game ..."

"The trademark refers to "computer game software and related instruction manual sold together as a unit; interactive video game programs; computer game discs; downloadable software for use in connection with computer games; video game controllers; interactive video game comprised of a CD or DVD sold as a unit with a video game controller." It looks like your guitar is going to get a friend."