class Beaming_info_list;
class Bezier;
class Bezier_bow;
+class Book;
class Break_algorithm;
class Change_iterator;
class Change_translator;
class Paper_book;
class Paper_column;
class Paper_def;
+class Paper_line;
class Paper_outputter;
class Paper_score;
class Paper_stream;
class Event;
class Event_chord;
class Event_chord_iterator;
-class Scaled_font_metric;
+class Modified_font_metric;
class Scheme_hash_table;
class Score;
class Grob;