3 texidoc = "Span bars are drawn only between staff bar lines. By setting
4 bar lines to transparent, they are shown only between systems.
9 \notes \relative c' \new StaffGroup <<
10 \new Staff { a1 a1 a1}
11 \new Lyrics \lyrics <<
15 \new Staff { f1 f1 f1}
20 \override BarLine #'transparent = ##t