Musical Structure
All the chords are major chords or seventh chords, and all the musical letters of the alphabet (A, B, C, D, E, F and G) are used. The song ends using a Shepard tone, with a chord progression built on ascending and descending lines in the bass and strings, repeated over and over as the song fades. Musicologist Alan W. Pollack analyses: "The chord progression of the outro itself is a harmonic Moebius strip with scales in bassline and top voice that move in contrary motion." The bassline descends stepwise A, G, F, E, D, C, and B, while the strings' part rises A, B, C, D, E, F#, G: this sequence repeats as the song fades, with the strings rising higher on each iteration. Pollack also notes that the repeated cell is seven bars long, which means that a different chord begins each four-bar phrase.
The song is in the key of A and the instrumental introduction starts in the Lydian mode of B major. Verse 1 begins with a I-♭III-IV-I rock pattern: "I am he" (A chord)..."you are me" (C chord) "and we are all toge..." (D chord) "...ther" (A chord). Verse 2, however, involves a ♭VI-♭VII-I Aeolian ascent: "waiting" (F chord) "for the van" (G chord) "to come" (A chord). The chorus uses a ♭III-IV-I pattern: "I am the egg-man (C chord) "they are the egg-men (D chord). "I am the walrus (E chord), "goo goo g'joob" hanging as an imperfect cadence until resolved with the I (A chord) on "Mr City Policeman." At the line "Sitting in an English garden" the D# melody note (as in the instrumental introduction) establishes a Lydian mode (sharp 4th note in the scale) and this mode is emphasised more strongly with the addition of a D# note to the B chord on "If the sun don't come."
Read more about this topic: I Am The Walrus
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