The walkotron is a simple project that you can make to create your own musical instrument. Gather your walkmans, some switches, wire and a speaker and you've got a basic melloman made out of walkmans. If you're feeling ambitious, download the code and fire up an arduino to make a sequencer! - PDF Link

Note: That's a photo of Eric playing the walkotron at Handmade Music Night!

Download the code - Link
Watch the video - Link
Subscribe - Link