It has to do with prank calls.
Way before they ever thought of forming a band called The Beatles, John Lennon, George Harrison and Paul McCartney all knew each other in freaking high school. And, during this time McCartney has just revealed why he and Lennon didn’t write down or record their earliest songs. When presented with an opportunity to use recording equipment, the pair apparently decided to create material for prank call instead.“We borrowed one once, and put a few songs on it,” McCartney told Jarvis Cocker in a Facebook Live interview on Wednesday when asked how he and John Lennon remembered their early songs. McCartney explained that recording equipment was expensive, and when they used a borrowed huge tape recording machine, they didn’t really spend much time putting their music on it.
Source: By Ryan Britt/fatherly.com