How to calculate the duration of the music example Vivaldi’s Summer Allegro non Molto part1
The Time Signature 3/8 each measure has 3 beats from the measure 1-11 we have 11 measures
Reference Time it’s 60
We divided Reference Time by the BPM and multiply by the number of beats on the measure multiply by the number of measures
60:80=0.75x3=2.25x11=24.75 that’s the duration of the first 11 measures.25.5”