Question: What American singer born in 1931 was managed by Allen Klein? 
Context: Christopher Edward Medina (born November 30, 1983) is an American singer born in Chicago, Illinois.  In late 2010 he auditioned for "American Idol" making it to the top 40 before being eliminated.  He is most famous for his hit "What Are Words", which reached number 1 in Sweden and Norway; it also charted in Denmark and made it to number 83 on Billboard Hot 100. Samuel Dale "Sam" Cook (January 22, 1931 – December 11, 1964), was an American singer, songwriter, and entrepreneur. Sidor Belarsky, born Isidor Livshitz (February 12, 1898 – June 7, 1975), was a Ukrainian-American singer born to a Jewish family in Kryzhopol, Ukraine.  He came to the United States in 1930 or 1931. Georges Dimou (Greek: Γιώργος Δήμου ; born 1931) is a Greek singer born in Thessaloniki.  He studied dramatic and vocal art in Athens and from the beginning he was successful as actor and singer with international repertoire. Allen Klein (December 18, 1931 July 4, 2009) was an American businessman, music publisher, writers' representative, filmmaker and record label executive, most noted for his tough persona and aggressive, innovative negotiation tactics, many of which established higher industry standards for compensating recording artists.  He founded ABKCO Music & Records Incorporated.  Klein revolutionized the income potential of recording artists, who previously had been routinely victimized by onerous record company contracts.  He first scored massive monetary and contractual windfalls for Buddy Knox and Jimmy Bowen, one-hit rockabillies of the late 1950s, then parlayed his early successes into a position managing Sam Cooke, and eventually managed the Beatles and the Rolling Stones simultaneously, along with many other artists, becoming one of the most powerful individuals in the music industry during his era. Tony Anthony (born Roger Pettito; October 16, 1937) is an American actor, producer, screenwriter and director best known for his starring roles in Spaghetti Westerns, most of which were produced with the aid of his friends and associates Allen Klein and Saul Swimmer.  These films consist of "The Stranger" series - "A Stranger in Town" (1967), "The Stranger Returns" (1967), "The Silent Stranger" (1968) and "Get Mean" (1975) - and the "Zatoichi"-inspired "Blindman" (1971).  Anthony also wrote, produced and starred in "Comin' at Ya! " (1981) and "Treasure of the Four Crowns" (1983), the first film being largely credited with beginning the 1980s revival of 3D films in Hollywood. Apple Records is a record label founded by the Beatles in 1968, as a division of Apple Corps Ltd.  It was initially intended as a creative outlet for the Beatles, both as a group and individually, plus a selection of other artists including Mary Hopkin, James Taylor, Badfinger, and Billy Preston.  In practice, by the mid-1970s, the roster had become dominated with releases by the former Beatles as solo artists.  Allen Klein managed the label from 1969 to 1973.  It was then managed by Neil Aspinall on behalf of the four Beatles and their heirs.  He retired in 2007 and was replaced by Jeff Jones. Laura Turner is an American singer born in Houston, Texas.  She came to public notice following the release of her album "Soul Deep" on Curb Records in 2003. Allen Klein (born April 26, 1938) is a pioneer in gelotology and the therapeutic humor movement.  In 1974, Klein's wife was only 34 years old when she died of liver disease, and the aspect where she had kept her sense of humor all the way to the end inspired Klein to give up his previous career as a theater and television scene designer and to study human development.  Klein is an American author and lecturer on the stress relieving benefits of humor and on gallows humor.  Among other positions, Klein was the 2005-2006 president of The Association for Applied and Therapeutic Humor. Howard Klein (born 1931 in Teaneck, New Jersey) is an American music critic, pianist, and former Director of Arts and Humanities at the Rockefeller Foundation.  He earned both a Bachelor of Science and Master of Science in Music from the Juilliard School.  He began his career as a music teacher and pianist for dancer José Limón.  In 1962 he became a music critic and reporter for "The New York Times".  He left "The Times" in 1967 to become the Assistant Director of the Rockefeller Foundation, although he continued to contribute articles to the newspaper periodically on a freelance basis into the early 1970s.  Klein played an instrumental role in the Rockefeller donation that established the TV Lab at Thirteen/WNET in 1971.  In 1973 he succeeded Norman Lloyd as Director of Arts of the Rockefeller Foundation.  In 1983 he became Deputy Director for Arts and Humanities for the foundation, a position he remained in until he left the organization in 1986.  He then worked as the Director of Artists and Repertory for New World Records.  Composer Charles Wuorinen dedicated his piano composition "Album Leaf" (1984) to him.  He is the father of tenor Adam Klein.
Answer: Sam Cooke