Designed by Adafruit (in collaboration with Jay Silver), Drawdio is an analog synthesizer circuit that straps to any soft-leaded pencil, and lets you crank out electronic sounds while you sketch. The kit takes advantage of the conductive properties of the graphite in the pencil lead, and produces a veritable cacophony of sounds as you put pencil to paper.

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So maybe you can’t call those otherworldly bleeps, beeps and squeaks “music”, but with enough practice you might be able to carry a basic tune… or you could give one of these a try the next time you have to fill in all those perfect little circles on your SAT or GMAT exam. I’m sure the test administrator would love that.

Adafruit sells the Drawdio kit for $19.50 (USD), including the circuit board, all necessary hardware and a 2B pencil. You’ll need basic soldering skills to put Drawdio together, so don’t expect it to work without some experience building electronic kits.