I came up with this for a contest being held over at www.wastelandoutpost.com where we were to build a post apocalyptic musical instrument for under thirty dollars. Being the cheapskate I am I made this one from scraps lying around the house, though to buy the stuff new it would still be under $10.
Super easy to make. Took me about an hour even though I am clumsy as hell when it comes to working with wire. Depending on your choice of supplies it could have easily been finished in half the time. And while they don't sound perfect I was able to belt out a killer 'Ode to Joy' even if it was a bit out of tune.
It has been brought to my attention by instrucatable member kill-a-watt that some very overly paranoid laws may make this build illegal in a few select places. Known locations so far are-
Washington DC and Massachusetts.
Apparently they consider any component of ammunition to be ammunition. For more information check out this blog post http://stuckinmassachusetts.blogspot.com/2010/03/just-for-emphasis.html