Producer and singer Midge Ure has spoken about the death of Sir George Martin, describing him as "one of the most wonderful people I have ever met."
In a phone call to GMB, Ure says "we all learned from George."
He credited Martin not only with giving the world the Fab Four, but with pioneering stereo music.
"Up until George got involved with the music industry, everything was in mono," he explains. "George insisted that we bring in a three-track tape recorder."
Spandau Ballet star Gary Kemp has described George Martin as "the Edmund Hillary of music" in a touching tribute to the Fab Four producer who died yesterday aged 90.
George Martin was the Edmund Hillary of music - adventurer, explorer, discovering routes for pop music we have all gratefully trod behind in
... He was also a beautiful, gentle man I had the pleasure of chatting to on many occasions. A Giant.
Celebrities ranging from Liam Gallagher to Roger Moore have paid tribute to 'fifth Beatle' George Martin, who has died aged 90.
Sir George Martin RIP LG x
RIP to my musical brother George Martin. We were friends since 1964, & I am so thankful 4 that gift. Bless u & your precious posse 4ever.❤️Q
Thank you Sir George Martin: the greatest British record producer of all time. We will never stop living in the world you helped create.
One of the great architects of music and sound, the great George Martin R.I.P.
How very sad to wake to the news Sir George Martin has left us. He made my first Bond film sound brilliant!
The man who made the Fab Four has died aged 90.Read the full story ›
Singer Boy George has called Sir George Martin as a "gentleman and a legend" as he paid tribute to the music producer on Twitter:
Sir George Martin. Gentleman and legend. R.I.P.
Sir George Martin's family "would like to thank everyone for their thoughts, prayers and messages of support" after he passed away at home on Tuesday, his manager said in a statement.
Prime Minister David Cameron has described Sir George Martin as a "giant of music" in a tribute to the record producer on Twitter:
Sir George Martin was a giant of music - working with the Fab Four to create the world's most enduring pop music.
Sean Ono Lennon, son of John Lennon and Yoko Ono, paid tribute to Sir George Martin on social media.
Posting a black and white picture of Sir George on Instagram, he wrote: "R.I.P. George Martin. I'm so gutted I don't have many words. Thinking of Judy and Giles and family. Love Always, Sean"
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The Beatles' record producer, Sir George Martin has died at the age of 90, according to Ringo Starr.Read the full story ›
The letter was written by John Lennon at the age of 11 to his aunt, thanking her for his Christmas presents.Read the full story ›