HAMON

Harmony Model and Notation

A universal, lossless harmony-label interlingua — one typed model for chord symbols, Roman numerals, Nashville numbers, figured bass and functional analysis, round-tripped across MEI · MusicXML · Humdrum · LilyPond · ABC · MuseScore · Harte · iReal Pro · DCML · RomanText · Dezrann.

ICCCM'26 →

Representative examples exported to every encoding, an interactive loss viewer, and the poster figures.

Use it →

Install the library and convert harmony between encodings, in three commands.

Fixtures →

The conformance corpus, browsable — each case realized as a real score and shown in every encoding.

To be presented at ICCCM 2026 — "Bridging harmonic representations through a multi-modal encoding."

Patricia Garcia-Iasci — Universidad de Alicante / Universidad de Salamanca, Spain
Johannes Hentschel — Anton Bruckner University, Linz, Austria
Fabian C. Moss — Julius-Maximilians-Universität Würzburg, Germany
David Rizo — Universidad de Alicante and Instituto Superior de Enseñanzas Artísticas de la Comunidad Valenciana (ISEA.CV), Spain

Open source: the code is Apache-2.0, the standard and its data are CC BY 4.0. Both ask for attribution — see how to cite and LICENSE.