Customized "Columbus Washboard" Kazoo
The kazoo is in the family of musical instruments call, "mirlitons". These instrument make their sound by sympathetic vibration with the human voice. The sound of your humming voice causes the wax paper resonator to vibrate in the kazoo, and the shape of the kazoo helps amplify and project the sound.
CAUTION: Continued Kazoo Playing Can Be Very Annoying to Spouses, Parents, and Co-Workers
