JamBuddy/src/data/kb/SCHEMA.md

KB Authoring Contract

Every knowledgebase cell must conform to this schema and pass node scripts/validate-kb.mjs. The gold-standard exemplar is jazz/ — imitate it. Background and rationale: docs/kb-plan.md.

Layout

src/data/kb/<style>/
  meta.js           — style identity
  progressions.js   — the style's standard progressions (instrument-independent)
  guitar.js         — instrument packs (piano.js, bass.js as cells are completed)

Register each style in src/data/kb/index.js. The UI reads only the registry.

Hard rules

1. Key-agnostic. Degrees and movable shapes only — never absolute chord names in data. Open guitar shapes are the one exception (they declare onlyRoot, a pitch class, and render only in matching keys).
2. Qualities must be keys of CHORD_TYPES in src/lib/theory.js (maj, min, dom7, maj7, min7, dim, dim7, half_dim, aug, sus4, sus2, maj6, min6, add9).
3. Intermediate level. Guitar: fret span ≤ 4 within a shape. Piano: one hand per recipe stays within a 10th. If a play is harder, provide an easier alternative in the same play set.
4. Plays for the same progression must be idiomatically different (register, density, technique) — not transpositions of each other.

meta.js

export default {
  id: 'jazz',                 // folder name
  label: 'Jazz',
  feel: 'swing',              // swing | straight | shuffle | 16th | bossa…
  tempoRange: [110, 230],
  character: 'One sentence on what makes the style sound like itself.',
}

progressions.js

export default [
  {
    id: 'jazz-251-major',       // '<style>-<slug>', globally unique
    name: 'ii–V–I',
    rn: ['ii7', 'V7', 'Imaj7'], // display numerals
    degrees: [2, 7, 0],          // semitone offsets from key root, 0–11
    qualities: ['min7', 'dom7', 'maj7'],
    bars: [1, 1, 2],             // same length as degrees
    mode: 'major',               // major | minor | dorian | mixolydian | …
    songs: ['Autumn Leaves'],
    tip: 'One transferable idea.',
  },
]

4–8 progressions per style. Cross-check docs/progression-repertoire.md §1.

Instrument packs

Common envelope:

export default {
  styleIntro: '2-3 sentences on this instrument's role in the style.',
  comping: [{ label, rhythm, description }],   // ≥1 named rhythm
  plays: { '<progression-id>': [ <play>, <play> ] },  // ≥2 plays per progression
  improv: {                                     // guitar/piano; optional for bass
    scales: [{ over: 'ii7', scale: 'dorian', why }],
    targetNotes: '…',
    licks: [{ tab/notation, description, over: '<progression-id>', source }],
  },
}

Guitar play

{
  label: 'Shell voicings',
  level: 'intermediate',
  chords: [        // one per progression step
    {
      shape: {
        // movable: fret offsets relative to the root fret; 'x' = muted
        rootStr: 6,                        // string carrying the root, 6 = low E
        offsets: [0, 'x', 0, 0, 'x', 'x'], // ALWAYS 6 entries, low E first
        fingers: [1, 0, 2, 3, 0, 0],
        // open shapes instead use: frets: [...absolute], onlyRoot: <pc 0-11>
      },
      extensions: ['9'],   // declared color tones beyond the quality (validator allows only these)
      // declared omissions (honest data, surfaced by the UI):
      // rootless: true — shape omits the root (e.g. guide-tone grips)
      // omit3: true    — shape omits the 3rd (e.g. power chords; works over major or minor)
      note: 'root–♭7–♭3',
    },
    // …
  ],
  tips: 'Voice-leading or ensemble advice.',
}

Piano play

Voicings are degree recipes resolved through the chord quality. Degrees: '1' '3' '5' '7' resolve per quality (e.g. '3' → ♭3 for min7); altered/extended degrees are explicit: 'b9' '9' '#9' '11' '#11' 'b13' '13' '6'.

{
  label: 'Rootless A/B alternation',
  level: 'intermediate',
  chords: [
    { recipe: { LH: ['3', '5', '7', '9'] }, note: 'Type A' },
    { recipe: { LH: ['7', '9', '3', '13'] }, note: 'Type B' },
  ],
  register: 'top note between C4 and C5',
  tips: '…',
}

Bass play

{
  label: 'Walking, chromatic approach',
  level: 'intermediate',
  bars: [{ beats: ['R', '3', '5', 'chrom>'] }],  // per bar of the progression
  // beat tokens: R 3 5 7 (chord degrees) · 'chrom>' / 'chrom<' (chromatic into next root
  // from below/above) · '5>' (dominant approach) · 'x' (ghost) · '-' (hold)
  tips: '…',
}

Musician checklist (self-review before committing)

• Plays per progression genuinely differ in register/density/technique
• Every shape/recipe is playable by intermediate hands (rule 3)
• The style is recognizable from the rhythm descriptions alone (bossa ≠ jazz with new labels)
• Every tip teaches a transferable idea (voice leading, register, space), not just "play this"
• Songs/licks have sources; nothing invented
• node scripts/validate-kb.mjs green; npm run build green