The kazoo is a musical instrument that adds a "buzzing" timbral quality to a player's voice when the player vocalizes into it. It is a type of mirliton, which is a membranophone, one of a class of instruments which modifies its player's voice by way of a vibrating membrane.
A kazoo player hums, rather than blows, into the instrument. The oscillating air pressure of the hum makes the kazoo's membrane vibrate. The resulting sound varies in pitch and loudness with the player's humming. Players can produce different sounds by singing specific syllables such as doo, who, rrrrr or brrrr into the kazoo.
Similar hide-covered vibrating and voice-changing instruments have been used in Africa for hundreds of years, often for ceremonial purposes. A popular belief is that Alabama Vest, an African-American in Macon, Georgia, was the one who invented the kazoo around 1840. However, there is no documentation to support that claim.
The first documented appearance of a kazoo was that created by an American inventor, Warren Herbert Frost, who named his new musical instrument kazoo in his patent #270,543 issued on January 9, 1883. The patent states, "This instrument or toy, to which I propose to give the name 'kazoo' "..." Frost's kazoo did not look like present-day submarine-shaped kazoos. The modern kazoo—also the first one made of metal—was patented by George D. Smith of Buffalo, New York, May 27, 1902.
In 1916, the Original American Kazoo Company in Eden, New York started manufacturing kazoos for the masses in a two-room shop and factory, utilizing a couple of dozen jack presses for cutting, bending and crimping metal sheets. These machines were used for many decades. After 1985, they were retrofitted with safety devices as per the Occupational Safety and Health Administration, but the manufacturing process remained the same. By 1994, the company produced 1.5 million kazoos per year and was the only manufacturer of metal kazoos in North America. The factory, in nearly its original configuration, is now called The Kazoo Factory and Museum. It is still operating, and it is open to the public for tours.