Here's a funny video about the Yosemite Marching Band (YMB) posted at YouTube a year or so ago.
"A group of naturalist musicians decide to form a much needed marching band for Yosemite National Park"
http://www.youtube.com/watch?v=y-sWc4COB44
An article about YMB is in the Spring 2006 issue of Yosemite, the journal of the Yosemite Association and available online at
“The Yosemite Marching Band Debuts” 68(2):14 by Werner Kemplerer
http://www.yosemite.org/member/YASpring%202006%20final.pdf
The article says YMB was created by local Yosemite teachers Hugh Sakols and Paul Amstutz. They bought their uniforms and musical instruments on eBay.