(CNN) -- Music manager Allen Klein, whose clients included the Rolling Stones and the Beatles, died Saturday after a lengthy battle with Alzheimer's disease, his publicist said. Klein was 77. 

The son of Jewish immigrants from Hungary, Klein founded his firm Allen Klein & Co. in the late 1950s before the label evolved into ABKCO Music & Records in New York. The independent label holds the copyrights to music by the Rolling Stones, Sam Cooke, the Animals, the Kinks, Chubby Checker, Bobby Womack and hundreds of others. 

Klein represented dozens of artists, including Sam Cooke, the Animals, Bobby Darin and Herman's Hermits. He changed the music industry when he represented Sam Cooke in negotiations with RCA, winning the artist control of his own master recordings. 

Known for a tenacious and often blunt style in negotiations, Klein's greatest coups were inking contracts with the Rolling Stones and the Beatles, though both relationships ended in legal battles. 

ABKCO built up a catalog of copyrights to more than 2,000 songs, including much of the Stones' 1960s catalog. Klein retained ownership of those titles even after splitting with the Stones. In 1969, John Lennon persuaded the other Beatles that Klein should take over the group's business affairs, but Paul McCartney resisted the move and some music historians say the appointment hastened the Beatles' split. 

Lennon later fell out with Klein, who was thought to be the target of the former Beatle's 1974 song "Steel and Glass." 

Defending his tough style, Klein told Playboy magazine in 1971: "The music business is about 99 percent no-talent losers who can't stand a winner in their midst."  QUESTIONS:

Q1:
1. Who founded Allen Klein & Co.?
2. Allen Klein & Co. exists thanks to whom?
3. Who was the creator of Allen Klein & Co.?
Q2:
1. When was Allen Klein & Co. founded?
2. When did Allen Klein establish his record company?
3. At what point did Allen Klein & Co. come about?
Q3:
1. What is Allen Klein & Co. today?
2. What is the present day name of Allen Klein & Co.?
3. How is Allen Klein & Co. referred to in the present day?
Q4:
1. What city can ABKCO Music & Records be found in?
2. Where is ABKCO Music & Records headquartered?
3. What city is ABKCO Music & Records based out of?
Q5:
1. Who managed the Rolling Stones?
2. Who was in charge of managing the Rolling Stones?
3. Who were the Rolling Stones managed by?
Q6:
1. Is Allen Klein still alive?
2. Is Allen Klein currently living?
3. Is Allen Klein still with us?
Q7:
1. When did Allen Klein pass?
2. On what day did Allen Klein die?
3. What was the day of Allen Klein's death?
Q8:
1. What condition was Allen Klein afflicted with?
2. What had Allen Klein been suffering from?
3. What illness did Allen Klein suffer from?
Q9:
1. What was the name of the Beatles' manager?
2. Who managed the Beatles?
3. Who were the Beatles managed by?
