# Identification probe result

The dossier shows a Classical-era keyboard texture in D major, 4/4: a singing treble line (V01) over an Alberti-style eighth-note bass (V03), opening with an anacrusis turn figure (A5 with grace B5, then G5–F#5 sixteenths) resolving to E–D over a D-major Alberti pattern (E001–E002). Later windows show chromatic neighbor motion (G#5, D#6, A#5), repeated-chord accompaniment under a rising melody (E010–E011), and a marked thematic return in W3 whose measures 1–5 (E017–E021) reproduce W1 measures 0–4 almost literally — consistent with a recapitulation in a sonata-form movement (return at 120 of 408 quarter notes into the second part).

These traits strongly suggest a keyboard sonata movement from the Viennese Classical idiom (Mozart, Haydn, or their circle), but I cannot match the specific incipit to a work I can name with defensible confidence. Several D-major candidates came to mind (Mozart K. 284, K. 311, K. 485; Haydn Hob. XVI D-major sonatas), but none of their openings match this melody as I recall them, so naming one would be a guess presented as recognition.

## Run metadata

- Analyst model: claude-fable-5 (Claude Fable 5)
- Date: 2026-07-19
- Case: CASE-Q2R9
- Access: dossier only; no external lookup performed or available

## Machine-readable result

```json
{
  "schema_version": "2.1.0",
  "analyst_model": "claude-fable-5",
  "case_id": "CASE-Q2R9",
  "identification": {
    "recognition_level": "style_only",
    "composer": null,
    "work": null,
    "movement": null,
    "confidence": 0.15,
    "evidence_ids": ["E001", "E002", "E010", "E011", "E016", "E017", "E018", "E019", "E020", "E021"],
    "reason": "D-major sonata-allegro texture with Alberti bass, anacrusis turn figure, chromatic neighbors, and a literal thematic return consistent with a Classical keyboard sonata recapitulation; incipit does not match any specific work I can name with confidence."
  }
}
```

## Limitations

Identification relies solely on symbolic content; no audio, title, tempo, or dynamics markings were available (directions arrays are empty). The incipit is generic within the Classical D-major keyboard repertoire, and many sonatas by Mozart, Haydn, Clementi, and contemporaries share these surface features. My recall of exact incipits is fallible, so absence of a match does not rule out a well-known work, and any specific attribution here would overstate recognition.
