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khodowany
2026-10-04 18:48:02 -05:00
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docs/composer/musical_capability_matrix.md
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# Capabilities and boundaries
# Demonstrated capabilities and limits
| Relationship | Active support | Limit |
| Behavior | Active implementation | Evidence |
|---|---|---|
| Theme/return | Source-derived feature and actual home realization | Technical similarity does not prove recognition |
| Mapped/chord movement | Complete sequences, chord traversal, contract-conditioned routes | Bounded search can miss alternatives |
| Anticipation | Joint arrival/hold and future-harmony contract | Bounded early window |
| On-time/delayed arrival | Selected pitch and uninterrupted tail | No compulsory arrival per cell |
| Approach into anticipation | Shared exact future target, both contracts | Wrong octave/changed target rejects |
| Enclosure | Both orders, semitone or mapped whole-tone upper | Must surround under the exact rule |
| Minor sixth | Bounded stable tonic/predominant color | Written semantics/function authoritative |
| Other colors/suspensions/blues | Existing explicit policies | Annotation is not permission |
| Rhythm | Coherent binary/tuplet groups and editable internal subdivision | No arbitrary tuplet slicing |
| Guitar | Strings 1–6, frets 1–12, no open strings | Not full ergonomic certification |
| Accompaniment | Independent canonical sparse comping | No reactive solo-gap filling |
| Reference review | All events, original labels, rule recognition | Observations distinguished from validated support |
| 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 |
Independent tests in `tests/test_joint_arrivals.py` extend the existing timing, evaluator, importer, physical, expression and dependency coverage. The four target files are not required fixtures.
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.
All four target solos have legal positions under the explicitly confirmed guitar-written octave convention. Four Autumn electric events extend beyond the source-derived production vocal cutoff. This is reported, not repaired by changing either input.
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.
Unexplained reference events remain explicit. Recognizing a relationship does not inject it into construction; selecting more expression contracts does not prove a better melody. Audition remains necessary.
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.