John Lennon explained why George Harrison worked a certain instrument into the song. John was a huge fan of the instrument.
A sound engineer said one of The Beatles‘ songs “got close to a breaking point.” Subsequently, he said George Harrison incorporated “intense” instrumentation into the song. Notably, the tune in question featured an instrument that was revolutionary at the time.
Geoff Emerick was a sound engineer for Abbey Road. During a 2022 interview with MusicRadar, he discussed “I Want You (She’s So Heavy).” “A fascinating song, very indicative of John’s mood at the time — he was consumed with all things Yoko,” he said.
Emerick was initially uneasy with one of John’s directives for the song. “I thought the song was going to have a fade out, but suddenly John told me, ‘Cut the tape,'” he recalled. “I was apprehensive at first — we’d never done anything like that. ‘Cut the tape?’ But he was insistent, and he wound up being right. The track, and side one, ends in a very jarring way.”
Source: Matthew Trzcinski/cheatsheet.com