Longa with a long stem
In LilyPond, the longa does not have a stem in the default style. If, for modernized old notation, you want to force a stem to appear and control its length, you can …
…--functions mylonga = #(define-music-function (pitch) (ly:pitch?) #{ \tweak Stem.length 9 %exagéré pour l'exemple \tweak Stem.thickness 0.5 % if style mensural ------------ %\once \… …1 \omit Staff.TimeSignature \mylonga g'^"longa long stem" \mylonga c'' \override Staff.NoteHead.style = #'baroque …