rubber band tray harp
2007
this is an instrument made from thirteen rubber bands, a toaster oven tray, and a barium titanate speaker. one plays it by simply plucking the rubber bands in a similar manor to a harp. it has a cable with a 1/8'' connector, easily adaptable to a 1/4'' connector. the sound is picked up by a barium titanate speaker on the back of the device. those are the tiny cheap speakers found in musical greeting cards and a number of other items. they work very well for contact mics.
it's tuned chromatically with the lowest and highest note being g. surprisingly, the rubber bands retain their tuning when being played (or when left alone). the rubber bands are easy to tune. simply grab the rubber band where it meets the inside edge of the tray and pull toward the outside to raise the pitch. pull toward the center of the tray to lower it. there is no good reason why the rubber bands are different colors and sizes except that that's all i had.
here's a sample of what it sounds like: audio