When you think of Rubber Soul, the iconic sixth studio album (in just two years!) from The Beatles, you likely envision its groundbreaking blend of folk, soul, and pop. But beneath its polished veneer are hidden gems of trivia and fascinating tidbits that shaped this masterpiece. Here are five little-known facts about the album that changed the game for rock and roll forever.

1. The Title Was Inspired By a Compliment (and a Slight Jab)
Paul McCartney was inspired to name the album Rubber Soul after overhearing an American musician describe Mick Jagger’s singing style as “plastic soul.” McCartney turned the phrase into a cheeky nod to The Beatles’ own attempts at soul music, adding a dose of self-deprecating humor to their groundbreaking LP.

2. “Norwegian Wood” Introduced the Sitar to Rock Music
George Harrison’s use of the sitar on “Norwegian Wood (This Bird Has Flown)” marked the first time the instrument was featured prominently in a rock song. Inspired by Ravi Shankar and introduced to the instrument during the filming of Help!, Harrison’s sitar work sparked a fascination with Indian music that would deeply influence the band’s later works.