AP Music Theory Unit 6: Motivic Development and Melodic Transformation

Motivic development

A compositional technique in tonal music where a short musical idea introduced early is reused and transformed across phrases, voices, or movements to create coherence.

Motive (motif)

A short, recognizable musical idea (pitch pattern, rhythm pattern, or both) that can be repeated and transformed; defined by recognizability rather than length.

Melodic motive

A motive identified primarily by its interval pattern and contour (shape) rather than by a specific rhythm.

Rhythmic motive

A motive identified primarily by its rhythm pattern, even if the pitches change.

Melodic-rhythmic motive

A motive defined by a specific rhythm combined with a specific pitch shape; common in tonal repertoire.

Unity and variety

A balance in music where repeated motives create connection (unity) while transformations of the motive prevent monotony (variety).

Phrase

A musical “sentence,” typically a complete musical thought that often contains motives and tends toward a cadence.

Antecedent phrase

The first phrase in a paired structure that sounds like a musical question and often ends less conclusively.

Consequent phrase

The answering phrase that often begins similarly to the antecedent (same motive) but ends more conclusively, typically with a stronger cadence.

Melodic devices

Recognizable techniques used to generate and shape melodies from motives (e.g., repetition, fragmentation, sequence, inversion, augmentation).

Literal repetition

Exact restatement of the same pitches and rhythms.

Varied repetition

A repetition that remains clearly related to the original idea but is altered (e.g., changed ending, rhythm, or some intervals).

Fragmentation

Using only part of a motive (a smaller “cell”) repeatedly, often to build intensity and drive toward a cadence.

Extension (of a motive)

Lengthening a motivic idea by repeating parts, sequencing, or adding extra notes to prolong the line (often delaying a cadence); not the same as augmentation.

Rhythmic displacement

Restating a motive so it begins on a different part of the beat (shifted earlier or later) while keeping the rhythm pattern recognizable.

Contour preservation

Keeping the general shape of a motive (e.g., up then down) while changing specific intervals, often to fit the harmony.

Sequence

Repetition of a melodic (often harmonic) pattern at different pitch levels, typically in a chain, creating forward motion.

Ascending sequence

A sequence in which each repetition starts higher than the previous one.

Descending sequence

A sequence in which each repetition starts lower than the previous one.

Transposition

Moving an idea to a new pitch level; if it occurs repeatedly in a chain, it is characteristic of a sequence.

Inversion

A transformation that flips the direction of each interval in a motive (up becomes down and vice versa) while keeping interval sizes as the basis and usually preserving rhythm.

Retrograde

A transformation where the motive is played backward in time: the order of notes (and rhythms) is reversed.

Augmentation

A rhythmic transformation that uniformly lengthens the note values of a motive while keeping pitch order (and usually interval pattern) the same—making the motive happen more slowly.

Diminution

The counterpart to augmentation: uniformly shortening the rhythmic values so a motive happens faster.

Theme (vs. motive)

A theme is typically longer (often a full phrase or more), while a motive is smaller and serves as building material for development.