Jam Sessions DS review at Pocketgamer.co.uk.

"Expecting Jam Sessions to provide a traditional game experience is a bit like expecting Napalm Death to deliver a jolly Broadway musical instead of their normal headache-inducing grind. Hence this virtual music maker (originally released in Japan as Sing & Play DS Guitar M-06) should be thought of as being an interactive instrument rather than a game.

To that extent it's a bit like Electroplankton, a title that also opened up a world of musical possibilities for DS owners, although Jam Sessions is more conventional in scope. But don't confuse it with the likes of Guitar Hero - there are no levels or high scores here."

Full Source: Siliconera