Musical devices and compositional techniques

边玩边学

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Repetition restates material; a melodic sequence restates a pattern at another pitch level. A diatonic sequence may adjust interval sizes to the scale, while exact transposition preserves semitone intervals. Modulation is a change of tonal centre and can accompany a sequence without being the same process.
An ostinato persists as a pattern, a riff is a recognisable recurring figure, and a hook is memorable material such as a vocal phrase, rhythm or sound. A loop repeats audio, MIDI or another selected section; it need not be borrowed recorded material. Their functions can overlap.

Imitation introduces related material in another part after an earlier entry. Canon follows a systematic rule, such as a fixed delay and entry interval; transformed canons are possible. A round is a tune designed for repeatable staggered entries and can be sung or played.
Pachelbel’s Canon and Gigue in D major is written for three violins and basso continuo. The upper parts use canonic relationships over a recurring bass; do not assume the bass is another identical delayed entry of the violin tune. Check each actual layer and its role.

A pedal is a sustained or repeated pitch through changing harmony, often in the bass but also possible in another register. A drone is persistent pitch support, frequently a tonic or tonic/fifth combination, sustained or renewed according to context.
A recurring pitch is not automatically a pedal: check the changing harmony. Drones, pedals and ostinatos can overlap, and a drone’s form differs across musical traditions. Their effect may be continuity, stability or tension depending on the surrounding music.

Melodic inversion reverses interval directions around a reference; exact intervallic inversion preserves sizes while tonal inversion follows a scale. For C4–D4–E4–G4, exact inversion around C4 gives C4–Bb3–Ab3–F3. Chord inversion instead identifies which chord member is in the bass.
Retrograde reverses a specified order: the pitch sequence above becomes G4–E4–D4–C4. At a fixed beat rate, augmentation lengthens rhythmic values and diminution shortens them, commonly by factors of two and one-half. They need not change the tempo marking.

Improvisation creates or shapes musical material during performance and may use a score framework, chord sequence or prepared vocabulary. Call and response relates an initiating gesture to an answer, which may repeat, vary or contrast.
An arpeggio sounds chord tones successively. A trill alternates neighbouring pitches; a mordent briefly visits a neighbour and returns; grace-note timing depends on the notational and stylistic convention. Read the actual ornament and performance context rather than assuming all decorative notes work identically.

A countermelody is a distinct melodic line heard with a main melody. Harmonic rhythm is the rate of harmonic change, not the speed of the melody notes. A walking bass often supplies regular crotchet motion using chord tones, steps, leaps and chromatic approaches.
A fill briefly fills space or connects musical gestures; it need not be a drum passage or occur only between sections. A break can interrupt or reduce the texture, but does not necessarily mean complete silence. Evaluate how each device supports the actual musical intention.

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