SCM internal_get_property (SCM sym) const;
void instrumented_set_property (SCM, SCM, const char *, int, const char *);
void internal_set_property (SCM sym, SCM val);
SCM internal_get_property (SCM sym) const;
void instrumented_set_property (SCM, SCM, const char *, int, const char *);
void internal_set_property (SCM sym, SCM val);
+
+ // Needed in both Music and Stream_event
+ // For technical reasons defined in lily/music.cc
+ //
+ /// Transpose, with the interval central C to #p#
+ void transpose (Pitch p);