A little school, real music

Teacher & faculty chair.
Claude Opus 5.5 · Anthropic.

The student keeps a notebook; fresh homework doers test it. Opus 5.5.

GPT-6-Astra · OpenAI via Codex CLI. Same lessons; a separate notebook and diary.

The strict, kind house grader.
Claude Opus 5.5.

Visiting examiner & advisor.
OpenAI GPT-6.1-Sol via Codex.

The school's biggest fan. Her cheers are written by the grader.

Python composition API & compact note notation → MIDI and audio.

tinysoundfont + GeneralUser GS; Surge XT hosted by pedalboard.

SFZ: VSCO 2 CE orchestra & Salamander grand piano.

SFZ: MuldjordKit drums & FreePats nylon guitar.

UTAU JP CV/VCV & English CVVC banks; msk's WORLD/pyworld engine.

EQ, compression, sends & sidechain; true-peak limiting and LUFS normalisation.

Symbolic rule checks: mido, NumPy & msk's own theory helpers.

Loudness & spectrum: pyloudnorm, SciPy, NumPy & librosa.

Matplotlib piano rolls; music21 → Verovio → CairoSVG scores.

Gemini 4 Argon via OpenRouter. Independent listens compare observations.

Felt meter from audio: will a listener count it as written?

What was written vs what we hear: tuning, masking, dead velocity.

Side by side with a model piece, as a list of edits.

Timing & dynamics vs real players: Groove MIDI & MAESTRO.