No one as yet has mentioned the harmonic structure of
I Am The Walrus.
Oddly, the song sounds a bit dark and moody, even threatening, yet there are only major chords in the song.
The melody, inspired by the sound of a British police car siren, is a strangely bizarre E - D# - E - D# - E - D# - E - D# - . . .
Pollock's harmonic analysis of the song is rather intellectually long-winded, (and a bit
incomplete, IMO), but worth perusing.
Notes on "I Am The Walrus"
Unlike many pop songs, whose clear chord progressions and distinct instrumentation keep the melody rather clean,
"I Am the Walrus" is one big formal musical jumble.