"He guided the career of The Beatles with such skill and good humour that he became a true friend to me and my family," Paul McCartney wrote of Martin.
The Gretsch 6120 Chet Atkins Nashville model hollow body guitar that John Lennon used while recording the Beatles' "Paperback Writer" has changed hands, with Indianapolis Colts owner Jim Irsay purchasing the instrument for more than $500,000.