Fran Holland's "Balloon Organ" uses a bunch of standard plumbing fittings, tuned with sliders and balloons to produce weird, eerie, bagpipe-style music. A large inflated balloon to one side provides the steady air pressure for the drone. Link (Thanks, Nirvan!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.