Part 5/11:
The next day, the band returned for additional tracking; a significant missing component was the bass guitar, which McCartney had not played during the previous session. Influenced by the powerful bass sound prevalent in Stax and Motown records, they enlisted EMI engineer Geoff Emerick for his expertise. Emerick employed unconventional methods, including rewiring a loudspeaker to function as a microphone to capture a broader low-frequency range.
McCartney, using a new Rickenbacker bass, overdubbed a vibrant bassline that defined the song's sonic landscape. This innovative approach would inform much of the "Revolver" album, showcasing The Beatles’ willingness to experiment and redefine their sound.