McCartney Times

In George Martin, the Beatles had a producer who excelled at thinking outside the box. Martin‘s innovative studio techniques and openness to new ideas made him the ideal producer for a group as wildly creative as the Beatles.But he was only human, and like most people he preferred to wrap up the workday at a reasonable hour.That didn‘t always sit well with the Beatles, particularly in their later years, when recording sessions frequently carried over past midnight..

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Source: The time the Beatles spiked George Martin‘s tea | GuitarPlayer