I took apart a bicycle bell and a toy xylophone and combined them to make a bell that works like a music box.
The melody it plays is "Mexican Hat Dance," something I heard a couple times late at night from a passing car while working on my Home posters. It was part of the inspiration to build this sort of bell for a bicycle.
Through a lot of trial-and-error, I figured out the best way to strike each key was to use the plastic end of a map needle and the best way to hold it in place was with extra foam board, tape and a rubber band.
Originally, the outside was supposed to be a tin can but things didn't work out in the fabrication process and I ended up standing in a Home Depot aisle for 2 hours figuring how to work around it.
I ended up going with foam board because I didn't have the proper tools to cut or mould wood and metal. The board's easier to cut through and thick enough that it won't give way.