Embedded Player The 1969 film 'Let It Be' created the impression that McCartney was responsible for The Beatles' disbanding. Now, the forthcoming Disney+ documentary 'Get Back' revisits the same time — and tells a different story. McCartney spoke with Terry Gross about his songwriting process with John Lennon, the early years of Beatlemania, and how the band broke up. He also has a new book called 'The Lyrics: 1956 to the Present.'