Mozart was actually born a girl;

her parents hid this fact from the public,
realizing that no amount of musical genius
could overcome the sexism so rampant in that society.

She and Salieri had been lovers;
she died in childbirth, which is
why Salieri blamed himself for her death.

As she had compsosed Church Music, the Catholic Church decided
it was better to have the public
continue to believe that Mozart
was a man.