Okay, this one takes some explanation. I went to an experimental music show last night called Elektrostube. It was in this warehouse downtown and featured multiple experimental music composers and performance artists. This was the Sauerkraut Synthesizer. It used naturally-occurring voltages from fruits and vegetables, transferred it to synthesizing software, which was then playing "music" throughout the space. You can't really see but he has an apple, potato, tomato, pickle, & sauerkraut hooked up to a bunch of different wires. Whenever he would irritate and pull on the wires the voltage would alter and change the frequency of sound. It was interesting to say the least.