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Update to Music Block

Snapshot Oct 6, 2026 · 00:02 UTC · version 1.2.0

WHAT CHANGED · RULE-BASED ANALYSIS

Package or technical metadata updated

Package contents changed in 23 files: .codex-plugin/plugin.json, skills/ensemble-arranging/SKILL.md, skills/ensemble-arranging/agents/openai.yaml, …. Open the file diff to inspect the edits.

Observed in package metadata. These changes alone do not establish a new customer-facing feature.

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Changed files

.codex-plugin/plugin.json →

skills/ensemble-arranging/SKILL.md →

skills/ensemble-arranging/agents/openai.yaml →

skills/ensemble-arranging/references/choir.md →

skills/ensemble-arranging/references/folk.md →

skills/ensemble-arranging/references/jazz-horns.md →

skills/ensemble-arranging/references/rhythm-section-bands.md →

skills/ensemble-arranging/references/string-quartet.md →

skills/human-melodic-phrasing/SKILL.md →

skills/human-melodic-phrasing/agents/openai.yaml →

skills/human-melodic-phrasing/references/bebop.md →

skills/human-melodic-phrasing/references/blues.md →

skills/human-melodic-phrasing/references/pop.md →

skills/instrument-ranges-and-idioms/SKILL.md →

skills/instrument-ranges-and-idioms/agents/openai.yaml →

skills/instrument-ranges-and-idioms/references/brass.md →

skills/instrument-ranges-and-idioms/references/drums.md →

skills/instrument-ranges-and-idioms/references/piano.md →

skills/instrument-ranges-and-idioms/references/strings.md →

skills/instrument-ranges-and-idioms/references/voices.md →

skills/instrument-ranges-and-idioms/references/winds.md →

skills/playable-fretted-parts/SKILL.md →

skills/playable-fretted-parts/agents/openai.yaml →

skills/ensemble-arranging/references/choir.md

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+# Choir and vocal groups
+
+## Roles
+
+| Ensemble | Parts | Melody in |
+| --- | --- | --- |
+| SATB choir | soprano-voice, alto-voice, tenor-voice, bass-voice | soprano |
+| SAB or three-part | soprano-voice, alto-voice, bass-voice (or tenor-voice) | soprano |
+| men's quartet (barbershop) | tenor-voice ("Tenor"), tenor-voice ("Lead"), bass-voice ("Baritone"), bass-voice ("Bass") | lead, second from top |
+| gospel | lead voice plus SAT or SAB backing | lead, backing answers |
+| unison with accompaniment | voice plus piano or guitar | voice |
+
+## Comfortable ranges (sounding)
+
+| Part | Comfortable | Peak only |
+| --- | --- | --- |
+| soprano | D4 to F5 | G5 to A5 |
+| alto | A3 to C5 | D5 |
+| tenor | D3 to F4 | G4 |
+| bass | G2 to A3 | E2 low, C4 high |
+
+## Part-writing
+
+- Homophonic (hymn) style for texted music: all voices in the melody's
+  rhythm, one note per syllable; a melisma of two or three stepwise eighths
+  at most.
+- Complete triads; double the root; drop the 5th before the 3rd.
+- Spacing: soprano to alto within an octave, alto to tenor within an
+  octave, tenor to bass up to a twelfth.
+- No crossing, no overlap. Inner voices by step or common tone. Soprano
+  and bass in contrary or oblique motion at cadences.
+- No parallel fifths or octaves between any pair; parallel thirds and
+  sixths welcome.
+- Leading tone up, chordal 7th down, suspensions resolve down by step.
+- Bass sings roots on strong beats, 5ths and 3rds on weak beats, moves by
+  step or fifth.
+- Cadences end phrases: half cadence on V at bar 4, authentic cadence at
+  bar 8 with the soprano landing on the root or 3rd.
+- Alterations: choir writing stays diatonic except one secondary dominant or
+  borrowed chord per eight bars.
+
+## Breath and phrasing
+
+- Every voice rests or holds a long note at least every two bars.
+- Phrases begin together; a voice may enter late for a staggered effect,
+  never leave early without a rest.
+- Repeated notes are natural (repeated syllables); a leap larger than a
+  fifth is followed by a step back.
+- Unison or two-part writing for a phrase gives contrast before the full
+  four parts return.
+
+## Gospel and pop vocal groups
+
+- Lead sings the melody with space; backing voices answer in the gaps with
+  short homophonic figures on the hook words, in thirds and sixths, or hold
+  a chord under the lead's long notes.
+- Backing voices sit below the lead when the lead is a soprano, around and
+  below when the lead is a tenor.
+- Piano comps rootless voicings; bass, if present, takes the roots.
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