Motif, phrase, and period
Music is built in nested units, like language builds words into sentences into paragraphs. Three sizes are worth naming.
Motif → phrase → period
| Unit | Size | What it is |
|---|---|---|
| Motif | 2–6 notes | the smallest recognisable idea — the seed a piece grows from |
| Phrase | ~4 bars | a musical sentence: a beginning, a middle, and an end (a cadence). "One breath." |
| Period | ~8 bars | two phrases — a question and an answer |
The motif. Ode to Joy's whole tune grows from one tiny stepwise idea. Beethoven's Fifth Symphony is built almost entirely from four notes — "da-da-da-DUM."
The period: question and answer
A period is an antecedent phrase (ends weak — a half cadence — "?") followed by a consequent phrase (ends strong — a perfect cadence — "."). The two usually start the same and end differently.
Sequence — a motif that climbs
One more device: a melodic sequence is a motif immediately repeated a step (or a third) higher or lower. It's how a tune develops without new material — and it's what a circle-of-fifths progression sounds like as a melody.
Try it
Try
Play the period example above. Stop at the end of bar 2 (on C) and wait — feel it hang, unanswered. Then play bars 3–4 and let the G land. Now try playing only the antecedent, or only the consequent: each sounds incomplete on its own. A period is a matched pair.
The usual mistake
Reading a long melody as one undifferentiated stream. It has joints — every ~4 bars there's a cadence, a breath, a phrase boundary. Find them (the cadence lesson tells you how), and the tune stops being a wall of notes and becomes a set of sentences you can shape one at a time.