Crystal Lake Central High School
Crystal Lake, Illinois
Keith Levin, Teacher
By Jill S.
To create the coffee-band, I first took an old coffee can and drilled ten holes in the side of it. Then, I took different lengths of rubber-band and stretched it very tightly across the top of the can, and stuck the ends of the rubber-bands through the holes in the can. I tied holes in the end of the rubber-bands on the outside of the can so they would stay.
The different lengths of the rubber-bands, where they are placed on the can, and how tight they are pulled all have an effect on the pitch the coffe-band makes. Generally, the closer to the middle you are, the lower the sound is because there there is more space for the sound to resonate in. The longer rubber-bands also create a lower sound. The tighter the rubber-bands are pulled, the higher pitched the sound is. If you pluck the rubber-bands harder, the sound is louder, and if you pluck them softly, it's quieter.
If you add water to the coffee can, the sound has more of an echo to it. The timbre of the instrument is dark and kind of fuzzy. This instrument makes sounds because the rubber-bands vibrate over a cavity, which creates a sound, the same way guitars and string instruments do.