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.