Did you ever think about how much electricity a mega-concert uses to power all those woofers and tweeters, not to mention the jumbo-screens and pyrotechnics?
Yes, a lot, no?
So, I was inspired by this little item about Cooper Boone, a psychologist-cum-musician who powers his sound system via a contraption tied to a stationary bicycle. Basically, fans (the human kind) can become the fuel for the speakers. Boone is currently traveling around the United States on his "Small Change, Big Planet Tour."
Here's a photo of someone fueling Boone's appearance in New York city a few weeks back for Earth Day.