\include "violoncello.ly"
\include "contrabasso.ly"
+%{
bassiGroup = \context PianoStaff = bassi_group \notes <
\staffCombinePianoStaffProperties
\context Staff=oneBassi {
\context Voice=oneBassi \violoncello
\context Voice=twoBassi \contrabasso
>
+%}
+
+bassiGroup = \context PianoStaff = bassi_group \notes <
+ \context Staff=violoncelloStaff <
+ \property Staff.midiInstrument = #"cello"
+ \property Staff.instrument = #"Violoncello "
+ \property Staff.instr = #"Vc. "
+ \clef "bass";
+ \global
+ \violoncello
+ >
+ \context Staff=contrabassoStaff <
+ \property Staff.midiInstrument = #"contrabass"
+ \property Staff.instrument = #"Contrabasso "
+ \property Staff.instr = #"Cb. "
+ \property Staff.transposing = #-12
+ \clef "bass";
+ \global
+ \contrabasso
+ >
+>