class Lyric_combine_music;
class Lyric_combine_music_iterator;
class Lyric_engraver;
class Lyric_performer;
class Mensural_ligature_engraver;
class Midi_chunk;
class Lyric_combine_music;
class Lyric_combine_music_iterator;
class Lyric_engraver;
class Lyric_performer;
class Mensural_ligature_engraver;
class Midi_chunk;