A kazoo is a simple musical instrument that produces sound when a person hums into it. It is typically made of plastic or metal and has a small, hollow body with a membrane that vibrates to create a buzzing sound. Kazoos are often used in group settings, making them popular for parties and informal music-making. The kazoo is easy to play, requiring no special skills or training. It is often associated with fun and playful music, and can be found in various genres, including folk music and children's songs. Kazoos are also commonly used in marching bands and parades for their cheerful sound.