← Back to the 1969-forward queue
Music theory · Abbey Road, track 8

Because

The Beatles · from Abbey Road (1969)

A study in classical voice leading and floating minor harmony.
Three voices move in close, chromatic harmony over a broken-chord accompaniment, and the tonic keeps its distance so the song never quite lands.

Key C# minor Core i–iiø–V (C#m–D#m7♭5–G#7) Voices three-part close harmony Feel suspended, non-cadential

Because, the theory in plain words

This is a slow, dreamy Beatles song in a dark home key called C# minor.

Three singers sing three different notes at the same time, stacked close together like a small choir.

The way those three lines move so smoothly, one step at a time, is called voice leading, the same craft used in classical music.

The guitar rolls each chord out one note at a time instead of strumming, which is why it sounds like a music box.

The chords keep drifting to unexpected places and never really settle on home, so the whole song feels like it is floating.

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

How to read this page. The key of Because and its opening i–iiø–V motion are well documented, but the song's chromatic continuation and the bridge are worth reading from a full transcription.
The chart below states the opening confidently and marks the rest to confirm.

The theory

Key & tonal center

A floating C# minor

The song is anchored in C# minor, but it treats the tonic as a place to leave rather than to rest on.
That reluctance to cadence firmly on home is what gives the whole piece its weightless, suspended character.

Harmony, the core device

Minor i–iiø–V with chromatic color

The opening moves from the tonic through a half-diminished second-degree chord to a dominant seventh, the classic minor-key i–iiø–V of harmonic-minor practice.
From there the harmony slides through chromatic, mediant-flavored chords rather than a plain diatonic path, which is the source of its unusual color.
Confirm the exact chromatic continuation at Isophonics and BeatlesFC.

Voice leading, the signature

Three voices in close, stepwise harmony

The vocal is a tightly spaced three-part harmony that moves largely by step, with each line kept smooth in the way a written chorale would be.
This disciplined voice leading, not any single chord, is the reason Because sounds composed rather than strummed, and it is the lesson the starter path picks it for.

Texture

Broken-chord, étude-like accompaniment

The accompaniment arpeggiates each chord, rolling the notes out one at a time instead of striking them together.
That study-like figuration keeps every harmony transparent, so the ear hears each chromatic shift clearly as it happens.

Form & cadence

A middle that modulates, an ending that hovers

The "love is old, love is new" bridge lifts the harmony to a fresh area before the verse returns.
Even at the close the song favors suspension over a decisive tonic cadence, so it resolves more by fading than by landing.
Confirm the bridge's exact chords at Pollack.

Key analysis

Key: C# minor.
Scale: C# D# E F# G# A B (natural minor); the song uses harmonic-minor color, a dominant G#7 (5) and a half-diminished D#m7♭5 (2).
DegreeChordNashvilleRoman
1C#m1mi
2D#°ii°
b3Eb3III
4F#m4miv
5G#m5mv
b6Ab6VI
b7Bb7VII

Nashville numbers

Chords sourced from a public transcription, in C# minor.

Verse

1mC#m
b3E
D#m7♭5
5(7)G#7
b6(maj7)Amaj7
1mC#m
b6(7)A7
bIID
dim

Bridge

4F#
5G#
5(7)G#7

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

Chord fingerings

These chords are movable barre shapes rather than open-position chords, so they are given as fret spellings (low E to high e; x = mute).
C#m (1m) is a plain minor barre shape. D#m7♭5 (2ø) = x 6 7 6 7 x. G#7 (5) = 4 6 4 5 4 4 (an E7 barre shape at the 4th fret).

Confirm the specifics here

Pollack, “Notes On Because”

Prose analysis of the C#-minor center, the chromatic harmony, and the three-part voice leading.

Open Pollack mirror →

Isophonics, annotations

Downloadable chord and key files: the exact chromatic chords and where the bridge modulates.

Open Isophonics →

HookTheory / TheoryTab

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

Open the Beatles index →

BeatlesFC

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

Open the paper →
Song 8 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.