There’s a book about musicals that every opera lover should read. Not Since Carrie by Ken Mandelbaum is a history of musical theatre’s greatest flops: a comprehensive study of the thousand ways in which a collaborative artform can crash and burn. It’s unbelievable stuff. The Broadway cast of 1961’s Kwamina participated in a voodoo ritual to neutralise the show’s critics (English National Opera is rumoured to be planning something similar).