(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." 
What was Allen Klein's occupation?
Did he have famous clients?
Who?
what was the name of his company?
did it change names?
What did it become?
Where was it based?
Who did he help win control of their work?
Did his work relationship with the Rolling Stones and the Beatles stay friendly?
what happened to them?
How many tunes did the company hold the rights to?
Did Paul McCartney want to partner with him?
Did any of the other Beatles?
Who convinced them to join with him?
What percentage of the music field did he consider to be losers?
Was he usually tactful?
what other musicians did he represent?
Did he hold any copyrights to any works by The Kinks?
What about Chubby Checker?
who did he argue against for Sam Cooke?
what did he die of?
music manager
Music manager Allen Klein, 
yes
Rolling Stones and the Beatles, 
The Rolling Stones and The Beatles
 Rolling Stones and the Beatles, died Saturday aft
Allen Klein & CO
ed his firm Allen Klein & Co. in the late 1950s 
yes
 before the label evolved into ABKCO Music & Records in New York. 
ABKCO Music & Records
 into ABKCO Music & Records in New York.
New York
 New York.
Sam Cooke
 he represented Sam Cooke in negotiations with RCA, winning the artist control of hi
no
les, though both relationships ended in legal battles. 
they ended in legal battles.
 though both relationships ended in legal battles. 
over 2000
atalog of copyrights to more than 2,000 songs, 
no
ut Paul McCartney resisted the move and
yes
John Lennon persuaded the other Beatles 
John Lennon
 John Lennon pe
about 99 percent
about 99 percent
no
Known for a tenacious and often blunt style 
Sam Cooke, the Animals, Bobby Darin and Herman's Hermits.
 Sam Cooke, the Animals, Bobby Darin and Herman's Hermits. 
yes
y the Rolling Stones, Sam Cooke, the Animals, the Kinks,
yes
Chubby Checker, 
RCA
Cooke in negotiations with RCA,
Alzheimer's
r a lengthy battle with Alzheimer's disease, his publicist said. Klein was 77. 