Harpo Marx
Arthur Adolph "Harpo" Marx (November 23, 1888 – September 28, 1964) was an American comedian and film star. He was the second oldest of the Marx Brothers. His comic style was influenced by clown and pantomime traditions. He wore a curly reddish wig, and never spoke during performances (he blew a horn or whistled to communicate). Marx frequently used props such as a walking stick with a built-in bulb horn, and he played the harp in most of his films. Description above from the Wikipedia article Harpo Marx, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Filmography
I Love Lucy
The Ed Sullivan Show
The Colgate Comedy Hour
The DuPont Show with June Allyson
The Dinah Shore Chevy Show
DuPont Show of the Month
General Electric Theater
La Fiesta de Santa Barbara
Duck Soup
A Night at the Opera
The Movie Orgy
A Night in Casablanca
Animal Crackers
Horse Feathers
A Day at the Races
Hollywood: Style Center of the World
The Big Store
At the Circus
Hollywood Out-takes and Rare Footage
A New Romance of Celluloid: The Miracle of Sound
The Cocoanuts
Oops, Those Hollywood Bloopers!
Stage Door Canteen
That's Entertainment, Part II
Monkey Business
From the Ends of the Earth
Room Service
The Story of Mankind
Brother, Can You Spare a Dime?
Going Hollywood: The '30s