I am not a (talented) musician, but I recognize game when I see it. At last night’s Hack and Tell, Grant Kot demoed his mobile app (iOS and Windows 7) that functions as a digital musical instrument. I bought it (99 cents on the app store) and had fun with it on the couch tonight. Of course, Grant, who’s a Julliard student, shows you what’s really possible in this video (should start 45 seconds in).
Grantophone