3 \context StaffGroup = a <
4 \context PianoStaff = b <
5 \context Staff = "c" \notes\relative c'' { b1 \break b }
6 \context Staff = "d" \notes\relative c'' { b1 \break b }
16 \consists "Staff_margin_engraver";
17 numberOfStaffLines = #1
18 marginScriptPadding = #10 % urg: this is in PT