class Rational;
class Relative_octave_music;
class Repeated_music;
+class Scale;
class Scheme_hash_table;
class Score;
class Score_context;
class Skyline_entry;
class Slur_configuration;
class Slur_score_state;
+class Spacing_options;
class Span_score_bar_engraver;
class Spanner;
class Staff_group_bar_engraver;