returns a tab of couples (i.e. tab of size 2). The ith elements correspond to the ith BPM changes in the score. The value of its element is the tab [position, BPM].

For example

       NOTE D6 1    event1
       NOTE C7 0    event2
       BPM 120
       NOTE D6 2  event3
       NOTE C7 2
       CHORD (D1 A7 Eb7) 4 event5
       BPM 30
       trill (CC6 D7 A7) 2 event6
with this score, @make_bpm_map() will return:
       TAB[  TAB[0.0, 60.0],
             TAB[1.0, 120.0],
         TAB[1.5, 30.0]  ]

See also Score Introspection

[@always_next_event_except_sil_pos]   @bach_score   @current_event   @event_label_position   @make_bpm_map   @make_bpm_tab   @make_duration_map   @make_duration_tab   @make_label_bpm   @make_label_duration   @make_label_pitches   @make_label_pos   @make_pitch_tab   @make_score_map   [@next_event_except_sil_pos]   [@next_event_with_sil_pos]   [@next_sil_pos]   @optional_attributes    @performance_data    @score_duration    @score_tempi   @specified_duration