Function chord_to_braille 

pub fn chord_to_braille(
    chord: &Chord,
    descending: bool,
    show_octave: bool,
) -> Transcription

A chord, its lowest or highest note written in full and each other as the interval from it, octaves marked where they are needed: music21’s chordToBraille. The written note is a note of the chord’s length and nothing else, as music21 writes it.