This is possibly the most engaging and interesting iPad app for music creation and/or science and math integration. I could see lessons on the physics of the objects interacting with one another or the algebra/geometry/trigonometry/calculus of the different sequences of events that create the music. If you have an iOS device, please check it out.
He owns a typewriter and collects Laserdiscs. He loves his three children quite a bit (aged 11, 16 and 18). He is passionate about authentic learning, technology with purpose, and creating at least one new thing every day. In short, he teaches, and learns. A lot.