5 \context StaffGroup = a <
6 % this is broken until further notice -- see refman
7 % \property Staff.StaffSymbol \override #'line-count = #4
8 \context Staff \outputproperty #(make-type-checker 'staff-symbol-interface)
10 \context PianoStaff = b <
11 \context Staff = "c" \notes\relative c'' { b1 }
12 \context Staff = "d" \notes\relative c'' { b1 }
22 \consists Instrument_name_engraver