Music Theory: Melody, Phrase Structure, and Variations

Anacrusis

An unstressed note or notes that precede the first downbeat of a phrase.

Phrase

A musical unit that expresses a complete thought, typically consisting of several measures.

Conjunct

A melodic movement that occurs by step, where notes are adjacent in pitch.

Disjunct

A melodic movement that involves leaps between notes that are not adjacent in pitch.

Stepwise

Movement in melody that progresses by small intervals, typically whole or half steps.

Antecedent-Consequent

A pair of phrases where the first (antecedent) poses a musical question and the second (consequent) provides the answer.

Period

A musical structure consisting of two phrases, typically an antecedent followed by a consequent.

Parallel Period

A musical structure where both phrases are similar in melody but differ in their endings.

Contrasting Period

A musical structure where the two phrases are distinctly different in melody.

Repeated Parallel Period

A structure where a parallel period is repeated, maintaining the same melodic content.

Double Period

A structure consisting of two pairs of phrases, where the second pair provides a stronger sense of closure.

Introduction

A section that precedes the main theme, setting the stage for the music that follows.

Internal Expansion

A technique that elaborates on a phrase by adding extra material within it.

Cadential Extension

An extension of a musical phrase that leads to a cadence, prolonging the resolution.

Elision

A technique where the end of one phrase overlaps with the beginning of another, creating a seamless transition.

Literal Repetition

The exact repetition of a musical phrase or section.

Imitation

A technique where a melody is repeated in a different voice or part, often at a different pitch.

Motive/Motif

A short musical idea or pattern that is developed throughout a piece.

Theme

A central musical idea that serves as the foundation for a composition.

Motivic Transformation

The process of altering a motif to create variation while retaining its identity.

Variation

A technique where a theme is altered in some way to create a new version while maintaining its essence.

Melodic Sequence

A repetition of a musical idea at different pitch levels.

Inversion/Melodic Inversion

A technique where the intervals of a melody are flipped, creating a mirror image of the original.

Mirror Inversion

A specific type of inversion where the melody is reversed in pitch direction.

Rhythmic Variation

The alteration of the rhythm of a melody while keeping the pitch content the same.

Augmentation

A technique that involves lengthening the duration of notes in a melody.

Diminution

A technique that involves shortening the duration of notes in a melody.

Rhythmic Displacement

A technique where the rhythm of a melody is shifted to start on a different beat.

Modulation

The process of changing from one key to another within a piece of music.

Mode Mixture/Modal Borrowing

The practice of borrowing chords or notes from a parallel mode to enrich harmonic language.

Ornamentation/Embellishment

Decorative notes added to a melody to enhance its expressiveness.