For you Opera Fans, this is an arrangement Pourquoi Me Reveiller from Werther, by Jules Massenet, using a very loose English Translation of the French Text. This is the great tenor aria that you can hear many a Tenor sing (Search the French Title on YouTube). Very different, but it works nicely in the a cappella style. (And yes, I do have a 4 part a cappella arrangement of "Nessun Dorma"…8-)