Update to Music Block

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/jazz-horns.md

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+# Jazz: combo horns and big band
+
+## Roles
+
+| Ensemble | Lead | Harmony | Bass | Comping | Time |
+| --- | --- | --- | --- | --- | --- |
+| trio | piano right hand | piano right hand | bass | piano left hand shells | drums |
+| quartet, quintet | trumpet or tenor-sax | second horn in thirds/sixths or counter-line | bass | piano | drums |
+| sextet, septet | trumpet | tenor-sax and trombone in block voicing | bass | piano (guitar optional) | drums |
+| big band in 8 parts | trumpet ("Trumpet 1") | trumpet 2, alto-sax, tenor-sax, trombone | bass | piano | drums |
+
+## Two horns
+
+- Thirds or sixths below the lead for the A section, unison or octaves for
+  the strongest statement, a counter-line (long notes moving against the
+  melody) for the B section.
+- Never a fourth or fifth for more than one beat unless both are chord tones.
+
+## Three horns (trumpet, tenor, trombone)
+
+- **Block voicing.** All three share the lead's rhythm. Under each lead note
+  place the two nearest chord tones below it, within an octave, choosing so
+  that the 3rd and 7th are present when the lead is neither. Trombone takes
+  the bottom, tenor the middle.
+- **Spread voicing** for long notes: trombone on the root or 3rd around
+  C3 to G3, tenor on the 7th or 3rd, trumpet on the melody or a tension.
+- **Alterations agree.** On a 7alt or 7b9 chord, the inner voices use b9,
+  #9, #11, b13 and the 3rd and b7 only. On a plain 7 they use 9 and 13.
+- **Lead ranges.** Trumpet melody in G3 to G5 sounding, peaks to Bb5. Tenor
+  inner voice C3 to C5. Trombone bottom A2 to F4.
+
+## Big band in eight parts
+
+- Saxes: alto lead, tenor a chord tone below, the pair in thirds and
+  sixths like a soli.
+- Brass: trumpet 1 lead, trumpet 2 a chord tone below within a fifth,
+  trombone on the guide tone that the saxes miss or the root of a spread.
+- **Tutti**: everyone in block voicing on the shout chorus, whole band
+  resting on the offbeat between punches.
+- **Sax soli / brass punches**: saxes carry a phrase for two bars, brass
+  answer with a two- or three-note punch on the offbeats, then rest.
+- **Backgrounds behind a soloist**: long notes (half and whole) entering
+  after the soloist's first bar, moving by step, never in the soloist's
+  register.
+
+## Voicing techniques
+
+- **Four-way close**: lead plus the next three chord tones directly below,
+  all within one octave.
+- **Drop-2**: four-way close with the second voice from the top moved down
+  an octave; the standard sax and brass sound.
+- **Rootless piano voicings**: 3-5-7-9 or 7-9-3-5 (with 13 replacing 5 on
+  dominants), right hand between C4 and A5, left hand a shell (root and 7th
+  or 3rd and 7th) between C3 and C4 only when there is no bass.
+
+## Rhythm section, medium swing
+
+- **Bass**: walking quarters. Root on 1, chord tone on 2 and 3, approach
+  note on 4 (a half step below or above the next root, or the 5th of the
+  next chord). One octave leap per four bars at most. Register E1 to G3.
+- **Piano**: comps in the gaps of the horns with three- or four-note
+  rootless voicings, Charleston rhythm (dotted quarter, eighth) or hits on
+  the and-of-2 and 4. Rests on most beats. Left hand doubles nothing the
+  bass plays.
+- **Drums**: ride on every quarter plus the skip note (an eighth on the
+  and-of-2 and and-of-4), hi-hat pedal on 2 and 4, kick light on 1 of
+  section starts only, snare comps sparse offbeats, crash on the first beat
+  of a section. With `feel: swing` write the skip as straight eighths.
+- Everyone lands the first beat of bar 1 and bar 5 together; between them
+  the horns rest and the piano answers.
+
+## Eight-bar head plan
+
+| Bars | Horns | Piano | Bass, drums |
+| --- | --- | --- | --- |
+| 1-2 | phrase 1 in block voicing | one hit at the end of bar 2 | walk, ride |
+| 3-4 | rest, or trombone holds a guide tone | fills the gap | walk, ride |
+| 5-6 | phrase 1 varied, higher | one hit | walk, ride |
+| 7-8 | cadence figure and a held last note | final voicing on the and-of-4 of bar 8 | fill in bar 8, crash on the last chord |