a small, simple musical instrument consisting of a hollow pipe with a hole in it, over which is a thin covering that vibrates and produces a buzzing sound when the player sings or hums into the pipe
A kazoo is a very simple musical instrument, made up of a hollow pipe with a hole in it. The hole is covered by a membrane that vibrates, resulting in a buzzing sound when people sing, speak or hum into the pipe. People have been making and playing kazoos for years.
