HarmTrace base is a library for representing musical chords. It is used in a small number of programs. At Chordify we build our back-end in Haskell and the HarmTrace-Base library is used to represent, store, manipulate, print chords etc. Basically the library offers a set of types and classes for representing musical chords in an unambiguous manner as presented in [1].
[1] Christopher Harte, Mark Sandler and Samer Abdallah (2005), "Symbolic
representation of musical chords: a proposed syntax for text annotations"
In: Proceedings of 6th International Conference on Music Information
Retrieval (pp. 66-71).
cabal install
or
stack init and stack build