/// Scale the music in time by #factor#.
void compress (Moment factor);
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// Broadcast the event in a context's event-source.
void send_to_context (Context *c);
DECLARE_SCHEME_CALLBACK (duration_length_callback, (SCM));
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protected:
virtual SCM copy_mutable_properties () const;
virtual void type_check_assignment (SCM, SCM) const;