The Beatles regularly found ways to hide interesting sounds, instruments, and phrases in some of their most iconic songs. However, there were many circumstances when fans didn’t realize the depths of surprises within these tunes. This included a classic French nursery rhyme hidden within the song “Paperback Writer” with backing vocals by John Lennon and George Harrison and lead vocals by Paul McCartney.
Lennon, Harrison, McCartney, and Ringo Starr pushed themselves as musicians and songwriters, setting trends followed today and evolving into musicians stretching the boundaries of popular music,
With the help of producer George Martin, Lennon, McCartney, Harrison, and Starr used their vast knowledge of music styles to push industry confines.
Some of the Beatles’ greatest innovations did not happen on the stage but in the studio. Ideas and techniques that became commonplace in the recording industry were either invented or advanced by the Fab Four during that progressive time period.
Source: cheatsheet.com