%{
violeGroup = \context PianoStaff = viole_group \notes <
+ \property PianoStaff.aDueText = #""
\context Staff=oneViole {
\property Staff.midiInstrument = #"viola"
\property Staff.instrument = #"Viola"
%}
violeGroup = \notes \context Staff = viole <
+ \property Staff.aDueText = #""
\context Staff=viole {
\property Staff.midiInstrument = #"viola"
\property Staff.instrument = #"Viola"