Core music theory and notation Library .
Ophis is a core music notation, theory, and analysis tool which can be used as the basis for other music applications. It supports contemporary/conventional notation and Gregorian notation.
Tonus — Pitch classes, pitches, octave designations.
Mensura — Time signatures, rhythms, note duration.
Nota — Notes, note expressions.
Melodia — Horizontal note structures (melodies, lines, voices, scales).
Chorda — Vertical and two-dimensional note structures (chords, harmonies, polyphony).
Signum — Clefs, staff and score expressions, additional markings.
Armonica — Music theory and analysis.
Scribo — Notation/printing via Lilypond, Gregorio, and other formats (MusicXML, ABC).
Medio — MIDI control.