The Beatles · Revolver
Tomorrow Never Knows
3 min readLast updated November 2026
Table of contents
Dynamics
- Variable, unpredictable dynamics — engineers independently fade individual tape loops in and out in real time; no conventional written dynamic markings
- Fade in / fade out structure — no hard attack or release; reinforces the dreamlike, consciousness-dissolving aesthetic
Rhythm / Tempo / Metre
- 4/4 throughout; moderate-fast tempo (♩ = 126 bpm)
- Contrast between vocal and accompaniment layers: lead vocal has a relatively steady, moderate delivery; tape loops create feverish, fragmented rhythmic activity around it
- Rhythmic devices in the tape loops and accompaniment:
- Syncopation — push rhythms in bass riff and tape loops
- Triplet crotchets and triplet quavers (guitar solo loop)
- Dotted rhythms and Scotch snaps (backward guitar loop)
- Crotchet triplets creating forward and backward metric displacement
- Cross-rhythms across simultaneous layers
Texture
- Overall melody-dominated homophony — solo lead vocal over a persistent C tonic drone
- Tape loops introduce electronic polyphony: multiple simultaneous independent lines create a layered, complex web of sound
- Homophonic moment (bar 11): B♭ and C chords create a brief block-chord texture within the polyphonic surface
- Textural layers:
- Solo voice
- Persistent C tonic pedal (drone)
- Bass guitar riff
- Multiple aleatoric tape loops (independent, layered)
- Sitar and tambura sonorities hint at Eastern drone-based meditation texture — reinforces the modal, static harmonic world
Structure
- Strophic form — melody and harmonic material repeat for each verse; no contrasting chorus
- Wider listening: cf. Bob Dylan ('Blowin' in the Wind', 'The Times They Are A-Changin') — strophic form typical of folk-influenced art songs
- No conventional introduction — fade in replaces a formal intro
- Outline:
- Faded-in introduction
- 3 verses (8 bars each)
- Instrumental (16 bars)
- 4 further verses (8 bars each)
- Coda — focused on repetitions of the final bars of the verse
- Outro — fades out
Melody
- Bars 6–9 (verse opening): outlines the tonic broken chord of C — direct, chant-like effect
- Bars 10–14: moves between C major and C Mixolydian — alternation of E and E♭ introduces pentatonic / blues scale inflections and pitch bends
- Final two phrases: move from the 5th degree up to the flattened 7th (B♭), then resolve to the tonic — archetypal Mixolydian contour
- Flattened 3rd (E♭, bar 23) — additional blues colour
- Same melody repeated throughout each verse — chant-like, hypnotic; reinforces the "monk chanting" aesthetic
- Tape-loop melodic material: wider in range and more random — contrasts with the regularity of the vocal line
Instrumentation / Sonority
- Lead vocal (John Lennon):
- Opening verses: automatic double tracking (ADT)
- Post-instrumental verses: routed through a revolving Leslie speaker — produces swirling, otherworldly timbre; evokes Tibetan chanting
- Tape loops — the defining sonic feature:
- 30 tape loops recorded; 16 selected — sound collage / musique concrète
- 8 tape decks operated independently by engineers, each choosing when to play their loop — aleatoric process
- Loop content:
- "Seagull" sound effect — McCartney laughing, sped up via varispeeding
- Orchestral chord of B♭ major
- Electric guitar phrase, reversed and played at double speed (backmasking)
- Sitar-like sound, reversed, multitracked, and varispeeded
- Tack piano (thumb tacks placed on piano hammers) — a form of prepared piano; adds percussive, brittle timbre
- Sitar and tambura — Eastern instrumentation; contributes to the drone-based, meditative texture
- Backmasking / varispeeding creates a chaotic, frenzied sonic atmosphere
Tonality
- C major throughout, with a strong Mixolydian modal inflection
- Prominent flattened 7th (B♭) — the defining modal characteristic; recurs melodically and harmonically
- Alternation between C major and C Mixolydian — no modulation; tonality remains static
Harmony
- Extremely static harmony — almost no functional chord progressions
- Harmonic material reduced to:
- Persistent C tonic drone (throughout)
- Oscillation between B♭ → C — the two chords of C Mixolydian
- No conventional cadences — dominant function entirely absent
- Indian classical influence: sustained tonic drone mirrors the harmonic world of raga-based music
- Tape-loop B♭ chord appears as an aleatoric harmonic event rather than a functional progression