Composing and Arranging
Composing and Arranging
Composing and arranging require you to create original music or adapt existing music for different forces. In the BGCSE, you may be asked to compose a short piece (e.g., 8–16 bars) for a specified instrument or ensemble, or to arrange a given melody with chords, bass line, and rhythm. You must show control of musical elements, structure, and notation.
Key concepts include: motivic development (repetition, sequence, inversion, retrograde); phrase structure (antecedent and consequent, question and answer); harmonic progression (using primary chords I, IV, V and secondary chords ii, vi); cadences; texture (melody and accompaniment, homophonic, polyphonic); instrumentation and range; and idiomatic writing for instruments (e.g., not writing below the range of a flute). You should also understand how to create a balanced structure (binary, ternary, or verse–chorus) and how to use dynamics, articulation, and tempo to shape the music.
Common traps: writing parts outside the instrument’s range; forgetting to include a bass line or chords when asked; using parallel fifths or octaves incorrectly (in classical style); failing to resolve a leading note; and not providing performance directions (dynamics, articulation, tempo). Another trap is writing a melody that is too repetitive or lacks a clear cadence.
Rule of thumb: start with a clear 4-bar phrase ending on a cadence, then repeat with variation. For arrangements, ensure the melody is in the top voice and the bass line outlines the harmony. Always check ranges and transpositions.
Worked example: Compose an 8-bar melody in C major for flute. Begin with a 2-bar motif (C–D–E–G), sequence it (D–E–F–A), then end the first phrase on a half cadence (G major chord) at bar 4. For bars 5–8, vary the motif and end with a perfect cadence (G–C). Add dynamics: mp at the start, crescendo to mf at bar 4, then diminuendo to p at the end. Ensure all notes are within the flute’s range (C4–C7).