You can use the NullVoice context as so: \version "2.19.15" \language "english" \score { \new Staff << \new Voice = "displayedMusic" \relative c'' { b8 c d \times 2/3 {c16 d c} b8 a g a bf c bf \times 2/3 {a16 bf a} g8 f g a bf f'...
A solution to your problem is to use the following construction: this is an example << {this will be in the top} \new Lyrics {and this in the bottom} >> only a single lyrics line once again from here on In your particular case, this results in: \version "2.18.2" \header...
To make a note head x-shaped you can use an override. In your example that would be: \times 2/3 { gis gis gis } gis4 \once \override NoteHead.style = #'cross cis | ...
You could use a simple regex substitution using this pattern ^\\[^\s]*: Sample code in python: import re p = re.compile(r"^\\[^\s]*", re.MULTILINE) str = ''' \item More things \subitem Anything ''' subst = "" print re.sub(p, subst, str) The result would be: More things Anything ...
As explained in the openlilylib website, where you probably downloaded the Improviso font, you must use lilypond version 2.19.12 or later. Also, be sure to copy the Improviso font inside the lilypond install directory. I suggest using this script.