Removing connecting bar lines on StaffGroup, PianoStaff, or GrandStaff
By default, bar lines in StaffGroup, PianoStaff, or GrandStaff groups
are connected between the staves, i.e. a SpanBar is printed. This
behaviour can be overridden on a staff-by-staff basis.
\relative c' {
\new StaffGroup <<
\new Staff {
e1 | e
\once \override Staff.BarLine.allow-span-bar = ##f
e1 | e | e
}
\new Staff {
c1 | c | c
\once \override Staff.BarLine.allow-span-bar = ##f
c1 | c
}
\new Staff {
a1 | a | a | a | a
}
>>
}