Tension and release in composition

Definition

Tension and release is the principle by which music creates expectations (instability) and then satisfies them (stability), or delays or betrays them. Leonard Bernstein, in the Harvard lectures “The Unanswered Question” (1973), describes tonal music precisely as a play of expectation and ambiguity. Leonard Meyer (“Emotion and Meaning in Music,” 1956) links musical emotion to the delay or inhibition of an expected resolution.

The six dimensions of tension

Harmonic: the dominant (G7 in C) tends toward the tonic (C). The more dissonances the chord contains (G7b9, G7#5), the stronger the tension.
Melodic: the leading tone B tends to C; the fourth F tends to E; long notes outside the chord (appoggiaturas) seek resolution.
Rhythmic: syncopations, accelerations (from eighths to sixteenths to thirty-seconds), snare rolls, triplets against a duple meter.
Dynamic: crescendo, increase in volume and density.
Timbral: filter opening, increased resonance, distortion, white-noise risers.
Structural (formal): the pre-chorus prepares the chorus; the bridge moves away before the final chorus.

Concrete harmonic tools in C major

Perfect cadence: G7–C (V7–I), maximum release.
Half cadence: ending a phrase on G (V): tension left open.
Deceptive cadence: G7–Am (V7–vi): the release is promised and denied, relaunching the phrase.
Dominant pedal: G in the bass for 4–8 bars with chords changing above (C/G, F/G, G7): the classic buildup before the return.
Sus4: Gsus4–G (4–3): micro-tension and release within the same chord.
Minor borrowing: F–Fm–C (IV–iv–I): “bittersweet” release.

Melodic tools

Appoggiatura: a dissonant note on the strong beat that descends by step onto a chord tone. Example: over C, the note D on beat 1 resolving to C. John Sloboda (1991) observed that appoggiaturas are among the events most associated with “chills” in listeners; the popular analysis of Adele's Someone Like You (2012) made this finding famous.
Suspension: a note held over from the previous chord that becomes dissonant and then falls (4–3, 9–8, 7–6).
Leap and recovery: a wide leap creates tension; the return by step in the opposite direction discharges it.

Tension in modern production

EDM build-up (8–16 bars): snare going from quarter notes to eighths to sixteenths, a high-pass filter rising from 20 Hz to 300–500 Hz, noise riser, pitch rising an octave, then 1 bar or 1 beat of silence before the drop: the release is the drop.
Drop-out: removing drums and bass for 2 bars before the chorus.
Pre-chorus with static harmony: holding IV or V for 4 bars.

Balancing the ratio

Too much tension without release is tiring; too much release is boring. A practical rule: every section should have at least one moment of instability and one of stability, and the strongest release of the song should be reserved for the last chorus (often with a key change of a semitone or a whole tone, or with full drums after a sparse bridge).

Use in real songs

Queen — Bohemian Rhapsody (1975): huge blocks of tension (the operatic section) resolved by the rock section.
Avicii — Levels (2011): classic build-up with filter and snare before the drop.
Adele — Someone Like You (2011): melodic appoggiaturas in the chorus.

Practical exercise

Write 8 bars in C major that end on G (half cadence). Repeat them and end on Am (deceptive). Repeat a third time with a G pedal in the bass over the last 4 bars and close on C. In FL Studio automate the cutoff of a pad over the last 4 bars and add a riser: compare the three versions.

Cadences, Non-chord tones, Pedal point and ostinato, Ambiguity and expectation (Bernstein), Arranging an EDM track, Contrast between sections.