
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.
Known for

I Love Lucy
1951

The Colgate Comedy Hour
1950

The Ed Sullivan Show
1948

The Dinah Shore Chevy Show
1956

The DuPont Show with June Allyson
1959

DuPont Show of the Month
1957

Go West
1940

Duck Soup
1933

Love Happy
1949

The Movie Orgy
1968

General Electric Theater
1953

The Cocoanuts
1929

Stage Door Canteen
1943

A Night at the Opera
1935

A Night in Casablanca
1946

A Day at the Races
1937

At the Circus
1939

Hollywood: The Dream Factory
1972

The Ten-Year Lunch
1987

Animal Crackers
1930

Room Service
1938

Monkey Business
1931

That's Entertainment, Part II
1976

Brother, Can You Spare a Dime?
1975