- /// The duration of this piece of music
- virtual Moment length_mom () const;
- virtual Moment start_mom () const;
+ DECLARE_SCHEME_CALLBACK (relative_callback, (SCM, SCM));
+ Pitch to_relative_octave (Pitch);
+ Pitch generic_to_relative_octave (Pitch);
+ Moment get_length () const;
+ Moment start_mom () const;