Things that could be added: - chordii -> chordpro? - VexTab? - Verovio? - tab (https://www.cs.dartmouth.edu/~wbc/lute/AboutTab.html)? - https://ctan.org/pkg/texchord - https://tex.stackexchange.com/questions/324828/typesetting-guitar-chord-diagrams-in-a-songbook - mention kpsewhich