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When I was a curator at Science World British Columbia, we used the  
electricity generated from a solar panel as well as water flowing and  
wind blowing and a hand crank to ACTIVATE separate musical robots.  
These were powered by another source as long as the exhibit was  
putting out a certain threshold. Each exhibit also showed the real  
amount of electricity being generated for those who were interested  
in that kind of thing. Each "robot" played a separate line of music  
as a metaphor of the various different energy sources working  
together to meet our "needs." If interested, this web page should  
have some more images of the  exhibit in the Our World gallery on  
sustainability.
http://www.scienceworld.bc.ca/whats_on/exhibitions/permanent_exh/ 
ourworld.htm

Cheers,
Raymond Nakamura, Ph.D.
Head
Raymond's Brain Consulting
www.raymondsbrain.com

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