Ever notice the similarity between the pre-chorus portions of I'm So Tired and The Continuing Story Of Bungalow Bill?
The two melodies are virtually identical. Each rises steadily through the third, fifth, and sixth degrees of the scale, repeating notes along the way, until it reaches the tonic.
The underlying chord progressions are similar, too, though they show some initial divergences. I'm So Tired has a I chord where Bungalow Bill has a chromatic III (V of A minor, the key in which the song's verse begins) and a chromatically altered V+ where Bungalow Bill has a plain V. But then, as both dominant chords progress "deceptively" to vi, the two passages come into complete harmonic alignment. Well, at least they do in their studio versions. Things unfold a little differently in the Esher demo version of Bungalow Bill (recorded in May of 1968). There Lennon takes the G chord to an A major chord rather than an A minor chord (VI rather than vi), a move that anticipates the modulation to the key of A major in the song's chorus.
