tonalis
A generic, format-agnostic music-harmony DSL for lead sheets: parse chord
charts to a canonical AST, lint them with structured findings, and render back
to canonical text or JSON. This is the Python reference implementation;
TypeScript (tonalis on npm) and Rust (tonalis on crates.io) ports conform
to the same normative spec and a shared 255-case conformance suite.
Music-theory questions (chord validity, scales, keys) are delegated to the
pure tonalis-music-dsl theory library.
Install
pip install tonalis
Use
from tonalis import parse_dsl, lint, serialize, to_json
result = parse_dsl(open("chart.txt").read())
findings = list(result.findings) + (lint(result.chart) if result.chart else [])
chart = result.chart # a LeadSheet AST
json_obj = to_json(chart) # canonical JSON (a dict)
text = serialize(chart) # canonical text rendering
A small CLI is included: python -m tonalis chart.txt prints lint findings
(exit 1 if any error).
Links
- Source, spec, docs, and conformance suite: https://github.com/drycode/tonalis
- License: MIT
1 maintainer
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