Weeks 9-10 · improvisation · agility scaffolding
Sing five notes on one syllable. Don’t re-attack.
The rule
pass: each beat ≤ ±45¢ · 4/5 notes · 4/5
One sustained syllable across five beats at 100bpm. The emerald trace glides cleanly through all five pitch anchors — that’s the melisma. The grey trace dips back toward the baseline between every anchor: a re-articulated breath or a fresh consonant attack on each note. That’s the failure mode this rule catches.
Hear it first
First clip: a gospel-style five-note run on “ah” — one breath, one syllable, five clean pitches. Second clip: the same five notes but with a re-attack on each — almost five separate syllables. Both have the right notes; only one has the gesture.
What’s happening. A melisma is multiple pitches on one syllable — the building block of gospel runs, jazz vocalese, baroque ornament, and most expressive singing. Mechanically, the larynx changes pitch while the vocal tract stays open and the cords keep vibrating. No breath reset, no consonant reset. Untrained singers default to re-articulating each pitch as if it were a new word; trained singers keep the airflow continuous.
Why 100 bpm, ±45¢. At 100 bpm each beat is 600 ms — fast enough to require real laryngeal agility, slow enough that the singer can still hit each pitch centre. The ±45¢ band is wider than the single-note-match tolerance (50¢) because we’re sampling the median of each beat-window — short notes don’t fully settle, so the band has to accommodate that physics.
Why this is the agility capstone. Every flourish in real repertoire — gospel melismas, jazz turns, baroque trills — depends on this skill. The downstream song-from-memory verses don’t require melismas, but the rhythmic-agility threshold this trains is the same one those verses exercise. If five notes on one syllable wobbles, longer ornamented passages will fall apart entirely.
Session ahead
5 trials at 100 bpm · listen, count-in 4 beats, then 5 notes on one syllable · 4/5 clean melismas promotes.