Persona DNA should read like a production brief, not a bio.
The best personas lock the repeatable parts of taste: vocal shape, arrangement habits, mix texture, and emotional boundaries. You want enough constraint to keep continuity, without flattening every song into the same prompt.
Voice
Range, delivery, phrasing, accent, vulnerability, confidence.
Palette
Core instruments, synth character, drum density, room tone.
Tempo
Typical BPM window, groove habits, section pacing.
Guardrails
What the persona never does, so iterations stay coherent.