"I'll Follow the Sun" is "a 'Leaving of Liverpool' song," McCartney explained in his 2021 book The Lyrics. "I'm leaving this rainy northern town for someplace where more is happening." Once they did leave, the band's rise to fame was stratospheric.
Composing for film or TV has been a dream of mine, basically since I can remember... I would love to keep doing that.
Almost all the major works from the second half of Pierre Boulez's composing career developed in the same way: their starting point is a small-scale ensemble or solo piece that served as the kernel for the much expanded and elaborated later score.