Mozart composed it for the parish of Baden Bei Wein for the fest of Corpus Christi. Full voice choir, strings, continuo, his manuscript contained few directions.

THERE! That phrase, it returns to D- Minor, resting on the dominant via two diminished seventh chords, accompanying the word "sanguine".

May 29, 1791. The premiere was marred that night by the discovery of the capo-maestro's daughter found murdered behind the parish church, the third killer of young girls who was never found.
I got this from the show Intruders. I don't know if the murder part is real but what I do wonder if anyone here knows the music and can comment on that. Or if that part is real that makes it even crazier.

The writers were either making things up or the "facts" regarding this piece are real. Like hell I'd know what a diminished seventh is so are they full of it?