Rubber Band Banjos

What to do:

  1. Cut a rectangular hole in one side of an empty half gallon sized cardboard milk carton.
  2. Ask children to put several large rubber bands around the carton, with part of the rubber band going across the hole that was cut.
  3. Strum the banjo and compare the sounds of different thicknesses of rubber bands, and also compare the sounds made by rubber bands stretched tighter than others.