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Music theory · Abbey Road, track 11

Mean Mr. Mustard

The Beatles · from Abbey Road (1969) · side-two medley

A study in the riff-driven medley fragment.
A one-minute blues-rock sketch carried by a bass-and-guitar riff, built to move rather than to resolve, handing straight off into Polythene Pam.

Key E Drive bass-and-riff Length ~1 minute Form segue fragment

Mean Mr. Mustard, the theory in plain words

This is a tiny song, only about a minute long, tucked inside the big Abbey Road medley.

It is carried by a riff, a short catchy pattern the bass and guitar play over and over.

It is bluesy and rocking, and it is built to keep moving instead of stopping on a nice ending chord.

People usually write it in a home key of E, but it is short and shifts, so the exact chords are best checked in a book.

It does not really end. It runs straight into the next song, Polythene Pam.

To see the exact chords and key, open Pollack or Isophonics.

How to read this page. Mean Mr. Mustard is a brief medley fragment. The chords below are from a public transcription; the segue into Polythene Pam has no closing cadence by design.

The theory

Key & tonal center

A shifting, riff-defined center

The fragment is short and defined more by its riff than by a stated key, and it is commonly transcribed with an E center that moves as it hands off.
Because it is a medley link rather than a standalone song, the tonal center is a means of transit more than a home to settle in.

Harmony

Blues-rock, riff-led

The harmony is driven by a repeated blues-rock riff rather than a developed chord progression, so the motion is horizontal and groove-based.
Confirm the exact chords and the riff's harmonic outline at Isophonics and BeatlesFC.

Rhythm & texture

Bass and guitar in lockstep

The bass and guitar move together on the riff, giving the fragment a lean, propulsive texture with little harmonic padding.
That tightness is what lets a one-minute sketch feel complete enough to stand inside the medley.

Form

A fragment, not a full song

The piece states its verse idea, makes a brief internal contrast, and moves on without a conventional verse-chorus build.
Its brevity is the point: it is one panel in a longer sequence rather than a self-contained arc.

Transition

Segue instead of cadence

Rather than closing with a tonic cadence, the fragment drives directly into Polythene Pam, using momentum as its ending.
The lack of a final resolution is deliberate, since the medley wants continuous motion. Confirm the exact pivot at Pollack.

Key analysis

Key: E (the fragment is short and shifts as it hands off to Polythene Pam).
Scale: E F# G# A B C# D#.
DegreeChordNashvilleRoman
1E1I
2F#m2mii
3G#m3miii
4A4IV
5B5V
6C#m6mvi
7D#°vii°

Nashville numbers

Chords sourced from a public transcription, in E.

Verse (“sleeps in the park”)

1E
5(7)B7
b7D
5(7)B7

Chorus / contrast

1E
b6(7)C7
5(7)B7

Segue into Polythene Pam

drives on without a cadence into the next track

Reading the numbers: each is a scale degree in E. Plain = major, m = minor, ° = diminished, (7) = a dominant-seventh coloring, b-degrees are borrowed chromatic steps.

Chord fingerings

Movable and open shapes (low E to high e; x = mute). E and D are plain open triads. B7 = x 2 1 2 0 2. C7 = x 3 2 3 1 x.

Confirm the specifics here

Pollack, “Notes On Mean Mr. Mustard”

Prose analysis of the fragment's tonal center, its riff, and the segue into Polythene Pam.

Open Pollack mirror →

Isophonics, annotations

Downloadable chord and key files: the exact chords and where the fragment shifts.

Open Isophonics →

HookTheory / TheoryTab

Roman-numeral function and melody for the riff, if a community tab exists.

Open the Beatles index →

BeatlesFC

Tonic, predominant, and dominant labels for the chords at phrase level.

Open the paper →
Song 11 of the 1969-forward queue. Theory only, no production notes.
Harmonic and formal claims are the broadly documented ones; exact chord and bar specifics live in the linked sources. See the full queue.