Call your Jam Sessions virtuoso friend (and, we suppose, your Hannah Montana Music Jam drummer). You'll finally be able to start that DS-only Electric Light Orchestra cover band you've been talking about, thanks to AQ Interactive and Korg.
Korg has created a DS version of their MS-10 synthesizer with some features that not even the original has. You can create music via a keyboard interface, a free-form touch-screen panel, or a "matrix" interface (fill in squares to make notes). It's certainly a lot smaller than the real thing, while also providing the authentic "a bunch of knobs and stuff we don't know how to use" experience.
AQ Interactive will release the DS-10 in Japan for 4,800 yen ($47) this July.