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docs/composer/musical_capability_matrix.md
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# Demonstrated capabilities and limits
# Capabilities and release limits
| Behavior | Active implementation | Evidence |
|---|---|---|
| New tune without a compulsory head rhythm | Source-independent action construction | Empty-head and held-head synthetic tests |
| Arpeggiated expansion / scalar route / neighbor motion | Complete contextual pitch route | Operation reachability and route tests |
| Development, answer, return, optional head reference | Heard-theme/source feature used only by the selected action | Each action requested and realized in eligible authored contexts |
| Open continuation / local settling / completion / handoff | Different timing and destination contracts | Candidate diversity and terminal-hold tests |
| Rest, pickup, syncopation, cross-bar group, tuplet | Exact rhythm groups and complete authored cells | Group, notation and playback tests |
| Early destination, approach, enclosure, connection | Joint proposals and existing typed validation | Positive/negative contract tests and final expression reports |
| Stable/resolving colors, prepared suspension, blues | General chord/function policy; complete realized evidence | Retained validator tests and construction coverage |
| All six strings; no open strings; frets 1–12 | Shared pitch domain and complete-melody placement | Physical tests and published TAB validation |
| No target dependency / no other generated-role dependency | Input audit and independent role cache | Dependency checks and full-song document hashes |
| Behavior | Current status |
|---|---|
| Ordinary scale motion, rests and held chord tones | Enumerable and validated |
| Complete scalar/third-stride groups | Reachable; exact scale indices, whole rhythm groups |
| Heard-theme return and inverted answer | Reachable from actual realization; no required count |
| Approaches, enclosures, prepared chromatic connections | Reachable joint actions; target, time and register validated |
| Anticipation with hold or deliberate reattack | Reachable and separately validated |
| Stable/resolving colors and anticipated colors | Reachable; complete sounding exposure checked |
| Delayed semitone resolution | Pending across actions; exact target and bounded deadline required |
| Prepared suspension and named blues inflection | Validators retained; no dedicated new action constructor yet |
| Optional full head quotation | No new constructor; source influence currently uses ordered interval relationships and rhythm evidence |
| Two-sided revision / phrase-level destination lookahead | Not implemented by the local action policy |
| All six strings, frets 1–12, no opens | Shared physical domain and whole-line fingering |
| Source-only independent accompaniment | Existing canonical sparse comping retained |
| Exact construction coverage for all four targets | Demonstrated by constrained derivation plus final harmonic validation; not a production winner |
| Exact unrestricted reproduction of all four targets | Requires the separate full-export gate; a fit/derivation alone is insufficient |
Not every enabled treatment must be selected in every song. Rejections and selected uses are separate from capability. A failed bounded search is not a proof that a musical solution is impossible.
A complete route is indivisible, but many independent single attacks remain available. This flexibility removes former coverage restrictions without proving melodic coherence. Source relationships are richer than an unordered interval set but remain a limited identity model. Register and fingering are separate; TAB legality is not biomechanical certification.
The source melody is optional material, not a compulsory blueprint. A return currently preserves the rhythm and direction of a short heard signature with harmonic adaptation; this is weaker than requiring its exact intervals. This can still be perceptually insufficient. Phrase-level context and the user's listening assessment remain important.
The route solver selects a complete path but internally uses a bounded pitch frontier. It does not perform a global whole-chorus optimum or arbitrary two-sided rewriting of committed phrases. One-phrase lookahead chooses a different complete alternative instead. Faster passages use a coarse tempo policy; legal TAB is not proof of human comfort.
Unsupported written chords still produce explicit mapper errors. No missing initial harmony is invented. Source-defined vocal protection remains authoritative even when a comparison reference continues beyond it. No new dynamics, swing, accents, velocities or timbral effects were introduced.
Unsupported written chords still fail explicitly. No source harmony is manufactured from a target. Electric may continue over the returning vocal pickup under the latest authorized allocation; vocal timing is unchanged. No dynamics, velocity shaping or new playback feel was introduced.