It features a prominent three-part vocal harmony by Lennon, Paul McCartney and George Harrison, recorded three times to make nine voices in all.

"[2][4] With regard to citing Beethoven's "Moonlight Sonata", musicologist Walter Everett notes that "both arpeggiate triads and seventh chords in C♯ minor in the baritone range of a keyboard instrument at a slow tempo, move through the submediant to ♭II and approach vii dim7/IV via a common tone.

"[5] But while acknowledging the unusual shared harmonies, Dominic Pedler notes that the relationship is not the result of reversing the order of the chords as Lennon suggested.

[6] "Because" concludes with a vocal fade-out on Ddim, which keeps listeners in suspense as they wait for the return to the home key of C♯ minor.

Each note between the guitar and harpsichord had to be exactly together, and as I'm not the world's greatest player in terms of timing, I would make more mistakes than John did, so we had Ringo playing a regular beat on hi-hat to us through our headphones.

"[10] A remixed version of the song, with the instrumentation removed so as to highlight the three-part harmony by Lennon, McCartney and Harrison, was released on 1996's Anthology 3 and as an a cappella on 2006's Love.