Question: Which composer, who won an Emmy award, shared a stage with Groucho Marx at Carnegie Hall in 1972?

Context paragraphs:
Harpo Marx: Arthur Marx (born Adolph Marx; November 23, 1888 – September 28, 1964), known professionally as Harpo Marx, was an American comedian, actor, mime artist, and musician, and the second-oldest of the Marx Brothers.  In contrast to the mainly verbal comedy of his brothers Groucho Marx and Chico Marx, Harpo's comic style was visual, being an example of both clown and pantomime traditions.  He wore a curly reddish blonde wig, and never spoke during performances (he blew a horn or whistled to communicate).  He frequently used props such as a horn cane, made up of a lead pipe, tape, and a bulbhorn, and he played the harp in most of his films.

Groucho glasses: Groucho glasses, also known as nose glasses or the beaglepuss, are a humorous novelty disguise which function as a caricature of the stage makeup used by the comedian Groucho Marx in his movies and vaudeville performances.  They typically consist of black frames (either round or horn-rimmed) with attached features including bushy eyebrows, a large plastic nose, bushy moustache, and sometimes a plastic cigar.  Considered one of the most iconic and widely used of all novelty items in the world, Groucho glasses were first marketed in the early 1940s and are instantly recognizable to people throughout the world.  Groucho glasses today are often used as a shorthand for slapstick.

Frank Ferrante: Frank Vincent Ferrante (born April 26, 1963) is an American stage actor, comedian and director known for his stage portrayals of legendary American comedian Groucho Marx in the Arthur Marx/Robert Fisher play "" and in "An Evening With Groucho", which tours internationally.

Hooray for Captain Spaulding: "Hooray for Captain Spaulding" is a song, originally from the 1928 Marx Brothers stage musical "Animal Crackers" and the 1930 film version.  It later became well known as the theme song for the Groucho Marx television show "You Bet Your Life" (1950–1961), and became Groucho's signature tune and was often played when he was introduced on various talk shows and the like.

Marvin Hamlisch: Marvin Frederick Hamlisch (June 2, 1944August 6, 2012) was an American composer and conductor.  Hamlisch was one of only twelve people to win Emmy, Grammy, Oscar and Tony awards.  This collection of all four is referred to as an "EGOT".  He is one of only two people (along with Richard Rodgers) to have won those four prizes and a Pulitzer Prize.

Howard Harris (writer): Howard Harris (February 15, 1912, New York City – March 22, 1986) was a comedy writer whose credits included "Copacabana" (1947) starring Groucho Marx and Carmen Miranda (), "The Jackie Gleason Show", "You Bet Your Life" with Groucho Marx, "Gilligan's Island", "Petticoat Junction", and other popular television shows.

Chico Marx: Leonard Marx (March 22, 1887 – October 11, 1961), known professionally as Chico Marx, was an American comedian, musician, bandleader, actor and film star.  He was a member of the Marx Brothers (Groucho Marx, Harpo Marx, and Zeppo Marx).  His persona in the act was that of a charming, dim-witted albeit crafty con artist, seemingly of rural Italian origin, who wore shabby clothes and sported a curly-haired wig and Tyrolean hat.  In virtually every film that includes the main trio of the Marx Brothers, Chico is seen working with Harpo Marx, usually as partners in crime.  Leonard was the oldest of the Marx Brothers to live past early childhood (first-born Manfred Marx had died in infancy).  In addition to his work as a performer, he played an important role in the management and development of the act in its early years.

Groucho: A Life in Revue: Groucho: A Life in Revue is a stage play written by Groucho Marx's son Arthur Marx and Robert Fisher .  With musical direction by Jim Grady.  It is a look at the life and career of the famous entertainer Groucho Marx of the Marx Brothers and "You Bet Your Life" fame.  It opened off-Broadway at the Lucille Lortel Theatre on October 8, 1986 and played 254 performances closing on May 3, 1987.  It starred 23-year-old actor Frank Ferrante as Groucho Marx from age 15 to 85, Les Marsden as Harpo Marx and Chico Marx, Faith Prince as The Girls and Rusty Magee as The Citizen of Freedonia.  It was directed by Arthur Marx.  The play opened to rave reviews. " The New York Times" wrote, "There is laughter in abundance" and described Ferrante's performance as "artful...his timing is digital sharp."  The "New York Post" dubbed it "hilarious...a brilliant revue."  "Groucho" was nominated for two NY Outer Critics Circle Awards - one for Best Play and one for Ferrante's performance.  Ferrante won a 1987 New York Theatre World Award for 'Outstanding New Talent.'  The play was produced by Nancy and Ronnie Horowitz.

Arthur Marx: Arthur Julius Marx (July 21, 1921April 14, 2011) was an American author, a former nationally ranked amateur tennis player, and son of entertainer Groucho Marx, and his first wife, Ruth Johnson.  He is named after Groucho's brother Arthur "Harpo" Marx.

An Evening with Groucho: An Evening With Groucho is the title of a 1972 recording at New York City's Carnegie Hall of the last one-man show by American comedian Groucho Marx.  Introduced by Dick Cavett, the show was released as a double album by A&M Records.  Marx shared family stories and performed songs from Marx Brothers movies.  Marvin Hamlisch accompanied Groucho on the piano.

Supporting paragraphs: An Evening with Groucho Marvin Hamlisch
Answer: Marvin Hamlisch