They were missing a couple of singers, so Luigi decided he would sit in for one of the altos ...
Here he is again. As you can see, he doesn't even need the music...
You can just see Mario get in on the act, on Luigi's left. He's singing second soprano.How come they can sing so high? Well, they have just been neutered.
Joking apart, at the time that Monteverdi was composing, it was very common to see castrati singing both in operas and in sacred choral music. But I don't think Signor M. had cats in mind when he came to write his masterpieces, somehow.
