I don't know a lot about electronics, but I had an idea. I realized the massive amount of energy that is spent playing drums, and I wondered if you could harvest it somehow. I'm wondering if I could attach some piezoelectric generators to the bottom drum heads (the outside one in the case of the bass head) and use it to pick up electricity to send to a battery and finally to a power supply of some sort. I'm think it would be really awesome to have drum kit lighting that was self contained -- hook a couple generators up to one drum, send them to lights, and theoretically the light would flash every time a drum was hit. All without a power supply. Failing that, maybe send the energy to a big battery where you could store electricity and power effects pedals or something. I'd look for other uses too if this worked. Can anybody tell me if this is possible/how I would go about doing it relatively cheap? Where could I go to learn more of the electricity principles I'd need for this?