Smashmouth Games, a relatively new casual developer (no relation to the band), is prepping a rhythm action game for WiiWare called Ongaku. Controlling the titular musical note, players must hit colored gems in time with music. Once hit the color is dispensed onto the background canvas and paints a picture. But missing notes angers the "Feedback Monster," and you wouldn't like him when he's angry.
http://uk.wii.ign.com/articles/977/977324p1.html
