I have no idea what f,,2/+c:3.5.8 is supposed to mean, and that gives me an error when I run your file.
Carl From: Pablo Cordal <pablocor...@gmail.com> Date: Wednesday, March 11, 2020 at 9:28 AM To: <lilypond-user@gnu.org> Subject: Markup in chordmode \version "2.18.2" #(ly:set-option 'midi-extension "midi") \score { << \new StaffGroup << \new Staff { \set Staff.instrumentName = #"Variciones" \set Staff.midiInstrument = #"acoustic grand" \clef "bass" \override Score.MetronomeMark.self-alignment-X = 1.5 \override Score.MetronomeMark.Y-offset = 3.5 \override Score.BarNumber.break-visibility = ##(#f #f #f) \time 4/4 \numericTimeSignature \tempo 4 = 70 \chordmode { c,,1:3.5.8 c,,2:3.5.8 d,,2:3.5.8 e,,4:3.5.8 f,,2/+c:3.5.8 r4 \bar "|." } } >> >> \layout { indent = #15 } \midi { } }