4 A second score-level header block shall not entirely replace a first header block, but only update changed variables.
9 \markup { \bold Note: expect piece and opus. }
15 piece = "Piece correct (set in score)"
16 opus = "Opus incorrect (to be superseded at score level)"
19 % This should NOT overwrite the piece from above!
20 opus = "Opus correct (superseded at score level)"