Jam Sessions DS review at DSFanboy.

"Ubisoft's Jam Sessions isn't a guitar. It sounds kind of like one, and encourages you to play melodies with it that were written for guitar. There have even been guitar-pick-shaped styli designed to be used with the program. But don't think of it as a guitar. It's not even a "virtual guitar." It's certainly not a game either, and not in the way that Brain Age is a non-game, but rather in the way that the web browser is not a game."

Full Source: DSFanboy