Thomas Adès’ new opera "The Exterminating Angel" is on stage at the Met, with an all-star cast including Amanda Echalaz, Alice Coote, Rod Gilfry, and Audrey Luna. In preparation for the Live in HD Broadcast this coming Saturday, November 18th, here is a pre-performance lecturer Dr. W. Anthony Sheppard, giving us a deeper look at this acclaimed new work and the surrealist movie that inspired it.