← Back to the 1969-forward queue
Music theory · Abbey Road, track 5

Octopus's Garden

The Beatles · from Abbey Road (1969)

A study in the 1950s doo-wop progression.
Ringo's tune runs a bright country-rock feel over the four-chord loop that built a decade of pop, then slips to a darker bridge and back.

Key E major Verse 1–6m–4–5 loop Feel country-flavored rock Bridge darker shift, then home

Octopus's Garden, the theory in plain words

Ringo sings this happy, splashy song on Abbey Road, in a bright home key called E major.

The verse rolls around the same four chords over and over, the exact loop behind a thousand 1950s songs.

Those four chords are the home chord and three of its close relatives, so the whole verse feels friendly and familiar.

The middle part slips into a darker, cloudier sound for a moment, then swims back home to the bright chords.

By the numbers, home is 1 (E), and the strong chord that pulls back home is 5 (B).

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

How to read this page. The verse loop below is the standard reading of Octopus's Garden, and the bridge chords are the part most worth checking against a source.
Treat the numbers as the frame and confirm the exact chart at the links below.

The theory

Key & tonal center

Rooted in a bright E major

The song plants itself firmly in E major with a clean, country-tinged rock lift.
There is no tonal ambiguity in the verse; the home chord is obvious, which is exactly what lets the darker bridge register as a departure.

Harmony, the core device

The four-chord 1950s loop

The verse cycles the doo-wop staple: the tonic, its relative minor, the subdominant, and the dominant, around and around.
That loop is the harmonic backbone of countless fifties ballads and early rock songs, and Ringo rides it plainly.
Confirm the exact chords and any passing colors at Isophonics and BeatlesFC.

Cadence

A turnaround that keeps circling

Each pass ends on the dominant leaning back to the tonic, so the verse never really stops, it just loops.
The pull of 5 back to 1 is what makes the four-chord cycle feel like a wheel rather than a line.

Contrasting section

A bridge that clouds over

The bridge leaves the sunny loop for a darker, more chromatic patch before steering back to the home key.
That brief shadow is the one spot where the harmony does something the verse loop cannot, so it is the section most worth studying.
Confirm the exact bridge chords at Pollack.

Melody & form

Plain, diatonic, verse and bridge

The melody stays inside the E-major scale and sits squarely on the chord tones of the loop, easy to sing by design.
The form is a straightforward verse with the contrasting bridge, the harmony carrying nearly all of the interest.

Key analysis

Key: E major.
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 major.

Verse / chorus loop

1E
6mC#m
4A
5B

Bridge

4A
2mF#m
b7D
1E

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

Chord fingerings

Every chord in the verse loop is a plain major or minor triad, so no special diagram is needed.
Standard open shapes for E, C#m, A, and B cover the whole verse.

Confirm the specifics here

Pollack, “Notes On Octopus's Garden”

Prose analysis of the E-major loop, the bridge shift, and the form.

Open Pollack mirror →

Isophonics, annotations

Downloadable chord and key files: the exact loop and the bridge chords in seconds.

Open Isophonics →

HookTheory / TheoryTab

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

Open the Beatles index →

BeatlesFC

Tonic, predominant, and dominant labels for each chord of the loop at phrase level.

Open the paper →
Song 5 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.