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I kind of doubt that Vivaldi's student orchestra at the girls' school was full of incredibly talented instrumentalists, who could toss off his fast bravura passages without a hitch.
I can't help but imagine them as an ordinary school orchestra, most of whom aren't particularly good or talented... and they all dread orchestra practice, because Fra Antoni refuses to either simplify his masterworks for beginner players, or accept the results. Concerts always sound utterly horrible, everyone slogging through music they barely can play, at various tempos that are all less than Vivaldi is beating, and he's always purple and hyperventilating by the end.