October 15th 2021 sees the release of a remixed special edition of Let It Be, the final album by The Beatles. To celebrate the occasion, Simon and Brian sat down with the excellent Giles Martin to talk about his work remixing The Beatles at Abbey Road Studios, the songwriting of Lennon & McCartney, his work on Peter Jackson's forthcoming documentary series The Beatles: Get Back, and memories of his father, Sir George Martin.