Composition, Arrangement and Improvisation
What you are being asked to do
Composition tasks reward a clear structural plan and idiomatic writing for the chosen forces. Arrangement asks you to re-voice existing material for new instruments or voices while keeping the original's identity recognisable. Improvisation asks you to generate coherent melodic material in real time over a given harmonic or rhythmic framework.
Concepts to command
- Form: binary, ternary, strophic, verse–chorus, 12-bar blues, AABA, through-composed; be able to label your own structure.
- Motif and development: repetition, sequence, inversion, augmentation, fragmentation, rhythmic displacement.
- Harmony: diatonic function, cadences (perfect, imperfect, interrupted, plagal), secondary dominants, modal mixture, pedal points.
- Texture and voicing: melody-and-accompaniment, homophony, polyphony, ostinato; playable ranges and transpositions for each instrument.
- Improvisation tools: guide tones (3rds and 7ths), chord-tone targeting, approach notes, pentatonic and blues-scale choices, motivic repetition, call and response, dynamic shaping to a climax.
Traps
- Writing beyond the instrument's range or ignoring breath and bow limits.
- A piece with a good opening and no destination: no climax, no cadence, no contrast section.
- In improvisation, endless scale-running with no motif, no rests and no dynamic arc.
- In arrangement, losing the original melody's shape, or transposing without checking the new instrument's key.
- Notation errors: wrong clef, missing key signature, incorrect grouping of beats.
Rule of thumb
Plan on one page before you write a note: a bar-count map with the climax marked. For improvisation, sing a two-bar motif internally, then state it, repeat it, alter it once, and leave a bar of rest.
Worked example
An eight-bar improvisation over a ii–V–I in C major (Dm7–G7–Cmaj7). Target guide tones: Dm7 (F, C), G7 (B, F), Cmaj7 (E, B). Play a two-note motif on beats 1–2, sequence it down a step, then land on E over the final chord and hold.