Structural Sections, Form & Melody
Building Blocks of Music
Understanding musical structure, form and melody is essential for analysing and creating music. This lesson covers the structural sections that make up a song, the standard forms used to organise them, and the scales, intervals and devices that shape a melody.
Structural Sections
Most songs are built from a set of recognisable sections, each with a specific function:
- Intro — the opening section that establishes the mood, tempo and key before the vocals enter.
- Verse — tells the story. The melody usually stays the same, but the lyrics change each time.
- Pre-chorus — a short section that builds tension and anticipation before the chorus.
- Chorus — the main hook of the song. It has the most memorable melody and repeats with the same lyrics and music.
- Bridge — a contrasting section that provides variety and prevents the song from becoming repetitive.
- Outro — the ending section, often a fade-out or a final statement of the chorus or theme.
- Middle 8 — an eight-bar section in the middle of the song that introduces new musical material.
- Refrain — a repeated line or phrase, often at the end of a verse (shorter than a full chorus).
- Coda — a concluding passage that brings the music to a definitive end (from the Italian for “tail”).
- Breakdown — a stripped-back section where instruments drop out, common in electronic and dance music.
- Drop — the moment after a build-up when the full beat and bass return with maximum energy (common in EDM).
- Riser — an ascending sound or build-up that creates tension before a drop or chorus.
The twelve structural sections you need to know are: intro, verse, pre-chorus, chorus, bridge, outro, middle 8, refrain, coda, breakdown, drop and riser. Each has a distinct role in the song.
Musical Form
Form describes how sections are arranged to create the overall structure of a piece. The spec requires you to know seven forms:
- Through-composed — no repeated sections. The music is different throughout. Common in art songs and film scores.
- AAA (strophic) — the same music repeats for every verse. Simple and repetitive, often used in folk songs and hymns.
- AB (binary) — two contrasting sections, A and B. Each is usually repeated (AABB).
- ABA (ternary) — three sections where the first section returns at the end. The B section provides contrast.
- ABCBA (arch) — a symmetrical structure that mirrors itself. Sections move away from the opening and then return.
- ABACA (rondo) — the A section keeps returning between contrasting episodes (B, C, etc.).
- 12-bar — a repeating 12-bar chord progression using three chords (I, IV, V). The foundation of blues, rock and roll and many pop songs.
Melody: Scales
Melodies are built from scales. Each scale has a specific pattern of intervals (tones and semitones) that gives it a distinctive character.
- Major scale — T, T, S, T, T, T, S. Sounds bright and happy.
- Natural minor scale — T, S, T, T, S, T, T. Sounds sad or melancholic.
- Harmonic minor scale — T, S, T, T, S, T+S, S. The raised 7th note creates a distinctive “exotic” sound and a strong pull back to the root.
- Minor pentatonic scale — T+S, T, T, T+S, T. Five notes, widely used in blues, rock and pop melodies.
- Major pentatonic scale — T, T, T+S, T, T+S. Five notes, bright and open-sounding. Common in folk and pop.
Major: T,T,S,T,T,T,S. Natural minor: T,S,T,T,S,T,T. Harmonic minor: T,S,T,T,S,T+S,S. Minor pentatonic: T+S,T,T,T+S,T. Major pentatonic: T,T,T+S,T,T+S.
Melody: Intervals & Devices
An interval is the distance between two notes. Diatonic intervals stay within the notes of the scale. Chromatic intervals use notes outside the scale (sharps and flats not in the key).
Composers use melodic devices to develop melodies:
- Retrograde — playing the melody backwards (reversing the note order).
- Inversion — turning the melody upside down. If the original goes up a step, the inversion goes down a step.
Melodic form describes the shape of a melody:
- Arch — the melody rises to a peak and then falls back down.
- Repetition — the same phrase or motif is repeated, often with small variations.
- Sequences — a melodic pattern is repeated at a higher or lower pitch.