-\notes { c1 c1 <
- {\clef "treble" c1 c1 }
- \context Staff = stb { c1 c1 }
- >
-}
- \paper {raggedright= ##t}
+ \relative c''
+ \new StaffGroup \with {
+ \remove "System_start_delimiter_engraver"
+ \override SpanBar #'glyph = #":"
+ } <<
+
+ %% solution 1
+ { c1 c1
+ <<
+ { c1 c1 }
+ \new Staff \with {
+ \remove "Time_signature_engraver"
+ } {
+ c,4^"ossia" es f fis g1
+ }
+ >>
+ c1 \break c c }
+
+ %% solution 2
+ \new Staff { R1*2 c,4^"ossia" es f fis g1 R1 * 3 }
+ >>
+
+
+ \paper {
+ raggedright= ##t
+ \context {\RemoveEmptyStaffContext}
+ \context {
+ \Score
+ \remove System_start_delimiter_engraver
+ }
+ }