LargeBraket = \markup { \magnify #1.8 { \line { \concat { \rotate#90 { "⎞"
"⎟" "⎟" "⎟" % to be completed/deleted for larger/smaller bracket
" " \raise#0.88"⎝" " " \raise#0.88"⎛"
"⎟" "⎟" "⎟" % to be completed/deleted for larger/smaller bracket
"⎠" } } } } }
music = {
\time 3/4
\key c \minor
s2.
}
\paper {
indent = 40
}
\score {
<<
\new ChoirStaff <<
\set ChoirStaff.systemStartDelimiter = #'SystemStartSquare
\set ChoirStaff.instrumentName = \markup { { \rotate #90
{ \center-column
{ "Orchestra I" \LargeBraket } } }
{ " " } }
\new StaffGroup <<
\override StaffGroup.SystemStartBracket #'collapse-height = #1
\override Score.SystemStartBar #'collapse-height = #1
\new Staff = "Oboe" {
\set Staff.systemStartDelimiter = #'SystemStartBrace
\set Staff.instrumentName = #"Oboe"
\music
}
>>
\new StaffGroup <<
\new GrandStaff <<
\new Staff = "vnI" {
\set Staff.instrumentName = #"Violino I"
\music
}
\new Staff = "vnII" {
\set Staff.instrumentName = #"Violino II"
\music
}
>>
\new Staff = "va" {
\set Staff.instrumentName = #"Viola"
\clef "alto"
\music
}
>>
>>
\new ChoirStaff <<
\new Staff = "Sop" {
\set Staff.instrumentName = #"Soprano"
\music
}
This is far from perfect plus, I've no printer here tonight so maybe you have to change some settings.
And there is still the square bracket from the first ChoirStaff that I don't know how to get rid of.