Sir George Martin, the record producer known as the Fifth Beatle, has died peacefully at his home, his manager has confirmed.
The 90-year-old helped The Beatles achieve global success as the head of the Parlophone record label after hearing their demo tape in 1962.
His manager Adam Sharp paid tribute to him as "a true gentleman to the end".
In a statement Mr Sharp said: "The family would like to thank everyone for their thoughts, prayers and messages of support.
"In a career that spanned seven decades he was an inspiration to many and is recognised globally as one of music's most creative talents. He was a true gentleman to the end.
"The family ask that their privacy be respected at this time."
Ringo Starr paid tribute to Sir George for his "love and kindness" to the Fab Four through the years.
He tweeted: "God bless George Martin peace and love to Judy and his family love Ringo and Barbara. George will be missed."
He captioned a picture of the Fab Four and Sir George with the phrase: "Thank you for all your love and kindness George peace and love."