There are so many genres of opera. There are the exquisite chamber operas that are close to plays like Strauss’ "Capriccio" of Gluck’s chamber operas. There are the operas of morality or ideology like Beethoven’s "Fidelio" or Mozart’s "Idomeneo." Some works highlight verismos raw emotions and atonal expressionism, decadent excesses like Berg’s "Lulu" or the opera of scandal, like "Salome" and the late romantic opera as epic poetry, "The Ring." The list goes on and on.
Few, if any, operas can bear comparison with the gestation, preparation and final execution of Giuseppe Verdi’s "Un Ballo in Maschera." It is the work that definitively closes his middle period; preceded by "Traviata,""Rigoletto," and "Il Trovatore" and followed by his supreme masterworks "Don Carlo," "Aida," "Otello" and "Falstaff."