Is it a keyboard? Is it a guitar? It's the ARKeytar, an Arduino-based MIDI controller shaped as a maple wood keytar. Thanks to the Arduino team for highlighting this one, the work of Andrea Gregorini ...

He built the early prototypes around an Arduino Uno. The current iteration uses a Teensy 2.0 and is available in various forms through Kickstarter.

The hack involved opening up the instrument and wiring the original keyboard matrix to the digital inputs of an Arduino Uno. The keys are read as a simple multiplexed array, and with a little work ...