When I first walked into the audition room, I had no prior religious training, no knowledge of ecclesiastic songs of praise, and no spirituality. And as I quickly found, Ancient Greek and Latin worship songs were no small part of our repertoire, comprising almost half the songs we were taught. One of the first songs I was introduced to was the Kyrie eléison ("Lord, have mercy") as part of the Missa Simplex - a liturgical hymn in Ancient Greek, bound in a scorebook with a Latin title.