+class Midi_tempo : public Midi_item
+{
+public:
+ Midi_tempo (Audio_tempo*);
+
+ virtual String to_string () const;
+
+ Audio_tempo* audio_;
+};
+
+class Midi_track : public Midi_chunk
+{
+public:
+ int number_;
+
+ /*
+ Compensate for starting grace notes.
+ */
+ Cons_list<Midi_event> event_p_list_;
+
+ Midi_track ();
+
+ void add (Moment delta_time_mom, Midi_item* midi);
+ virtual String data_string () const;