Here's the complete concert that brought together four of the world's most exciting singers, performing beloved arias, duets, and quartets. Anna Netrebko and Elina Garanca appear together for the first time on stage in this dazzling gala for a quartet of "superstars" (Badische Zeitung). "Bel canto at its most beautiful and most ravishing" (Badische Neueste Nachrichten).