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The difference between a melody and a run lies not in the notes chosen but in breathing:
A run keeps going; a melody stops, breathes and closes.
So to tell whether something is a melody or a run, ask one question: where does it breathe? If you cannot answer, it is a run.
Three signals of breathing
| Signal | Explanation | Strength |
|---|---|---|
| long note | one note noticeably longer than its neighbours, creating a pause | weak to medium |
| rest | a literal gap | medium |
| cadence | closure at the harmonic level (see [[concept:cadence | cadence]]) |
Their strengths differ, so phrasing is hierarchical: a long note is a comma, a rest a semicolon, a cadence a full stop. The level of a section is read from where it stops (see phrase and period).
The vocal priority: write for the breath
A practical fact: phrase length in a melody is limited by breathing.
| Singer | Rough length in one natural breath |
|---|---|
| an ordinary singer at a moderate tempo | 4–8 bars |
| a trained singer | longer, but by technique, not by default |
So a phrase written too long forces the singer to sneak a breath in the middle — which cuts the phrasing in the wrong place. "Can it be sung in one breath" is therefore a hard constraint on melodic writing.
Instrumental writing inherited the rule: even with nobody singing, melodies are still shaped in singable phrase lengths, because that matches the listener's expectation.
Phrasing in performance
For a performer, phrasing is not analysed but made:
| Means | Effect |
|---|---|
| breath (a tiny pause or inhalation) | marks the phrase |
| dynamic shaping | gives the phrase a direction (often matching an arch contour) |
| flexible timing | a slight easing at the end, a slight urgency at the start (see [[concept:metronome |
| change of colour | a slight timbral shift at the break |
Wind players and singers make this most obvious: they must physically breathe, so their phrasing is physiological. Strings and keyboards can play on without breathing — which is exactly why unphrased playing sounds like an exercise.
Diagram: three strengths of pause
Listen: with and without breathing
Use scale to hear a scale — a form without breathing (onward motion at an even rate). Then think of the Ode of Joy: the same kind of stepwise motion, but with each phrase landing on a longer note, it becomes a melody.
Common misconceptions
- "Breathing is only a performance matter." It exists at the writing level: phrase length is limited by
- "All pauses are alike." They are hierarchical: long note (comma) < rest (semicolon) < cadence (full stop).
- "Instrumental music need not consider breathing." Instruments need not actually breathe, but melodies are
- "Phrasing is a matter of feeling." It has evidence: long notes, rests, cadences, plus the punctuation of the
singability, and instrumental music inherits the limit.
Where it stops sets the level of division.
still written in singable lengths — otherwise the listener loses the sense of phrasing.
words or verse. :::
Listen in the library
All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).
Sources
- 旋律呼吸的常见信号（长音、休止、终止式）为旋律与演唱实践通行表述
- 声乐呼吸长度对旋律写作的约束（"可唱性"）为歌曲写作通则
Used for fact-checking only; all prose is original.