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

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+# Voices (sounding pitch)
+
+| Instrument | Comfortable | Full range | Notes |
+| --- | --- | --- | --- |
+| soprano-voice | D4 to G5 | C4 to A5 | top notes on open vowels, long values |
+| alto-voice | A3 to C5 | G3 to D5 | warm middle, avoid sitting below A3 |
+| tenor-voice | D3 to F4 | C3 to G4 | ringing above C4; G4 is a peak |
+| bass-voice | G2 to A3 | E2 to C4 | roots and fifths, slow moving |
+| voice (generic) | A3 to E5 | G3 to G5 | treat as a mezzo or high tenor; keep the total range inside a tenth |
+
+## Writing for a singer
+
+- Stepwise motion and leaps up to a sixth; a leap larger than a fifth is
+  followed by a step back in the opposite direction. An octave leap is a
+  climax, once per example.
+- Total range of a singable melody is a tenth to a twelfth.
+- Phrases of 1 to 2 bars with a rest for breath; the phrase ends on a longer
+  note.
+- Repeated notes are natural (text is repeated syllables); a melody that
+  changes pitch on every note is instrumental, not vocal.
+- The highest note comes once, in the second half, on a strong beat.
+- Melismas (many notes on one syllable) move stepwise in eighths, not
+  sixteenths, unless the style is gospel or R&B.
+
+## Choir (SATB)
+
+- Soprano and alto within an octave; alto and tenor within an octave; tenor
+  and bass up to a twelfth. No voice crossing.
+- Bass sings roots on strong beats and fifths or thirds on weak beats; inner
+  voices move by step or hold common tones; soprano has the melody.
+- Every voice needs the same number of bars; rests where a voice drops out.
+- Doubling the root in bass and soprano at cadences is normal.
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