15 PL_instantiate(Line_of_staff
);
17 PL_instantiate(Line_of_score
);
18 PL_instantiate(Request
);
19 PL_instantiate(Spanner
);
20 PL_instantiate(PStaff
);
21 PL_instantiate(Idealspacing
);
23 PL_instantiate(Command
);
24 PL_instantiate(Score_column
);