Cardboard instruments- 1. Cut out a smooth hole in the shoebox lid. 2. Place 4 or 6 elastic bands around the shoebox, starting with the thickest closest to you then gradually getting smaller. 3. Take 2 pencils or something protruding and put each one toward the end of the box at both sides, creating the bridge for the guitar. 4. Your guitar is ready to be strummed!