1Up reviews the 'guitar in a box' Jam Session for DS:
"Chances are you had or currently have a friend in high school or college who "knows" how to play the guitar. And more often than not, this knowledge translates into the first 20 seconds of a handful of popular songs...and that's about it. The first four chords of "No Rain" (Oh, I love that song!), and it's quickly on to "Stairway to Heaven." And under the right circumstances, that dude is totally awesome.
Jam Sessions is kind of like that friend, in videogame form. Don't go into this expecting a handheld Guitar Hero: There's no "game" to speak of. Rather, Jam Sessions is part of the same software family as Electroplankton and Traxxpad -- nifty little musical tools that, while short on bells and whistles, offer a fun diversion or a little flexibility to a home recording setup."