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Paul McCartney likely composed the verse on either piano or with a vocal line in mind, while John Lennon may have contributed the harmonic support to shape the chorus. These layered contributions lend themselves to the striking beauty of the breakdown—where the chordal movements and melody intertwine, crafting a serene yet complex auditory experience.

Conclusion

"She’s Leaving Home" remains one of the most celebrated tracks from the Sgt. Pepper's album, showcasing the Beatles' sophisticated songwriting and musical ingenuity. By breaking down its components—chords, intervals, and overall structure—we gain insight into what makes a melody not just good, but perfect.