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The rate of the beats in a passage of music, sometimes expressed in metronome beats per minute (BPM) and sometimes by the Italian system of names

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How to change the MIDI tempo with scheme?

I manage to add a tempo change on the score (with #(make-music 'TempoChangeEvent ...)), but it doesn't affect the MIDI output, like \tempo would do. But it is exactly what I would need though. … #{ #(make-music 'TempoChangeEvent 'metronome-count 180 'tempo-unit (ly:make-duration 2)) \applyContext #(lambda (context) (ly:context-set-property! …
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