If music in general is an imitation of history, opera in particular is an imitation of human willfulness; it is rooted in the fact that we not only have feelings but insist upon having them at whatever cost to ourselves. Opera, therefore, cannot present character in the novelist's sense of the word, namely, people who are potentially good
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The quality common to all the great operatic roles, e.g., Don Giovanni, Norma, Lucia, Tristan, Isolde, Briinnhilde, is that each of them is a passionate and willful state of being. In real life they would all be bores, even Don Giovanni.
In recompense for this lack of psychological complexity, however, music can do what words cannot, present the immediate and simultaneous relation of these states to each other. The crowning glory of opera is the big ensemble.
The chorus can play two roles in opera and two only, that of the mob and that of the faithful, sorrowing or rejoicing community. A little of this goes a long way. Opera is not oratorio.
Drama is based on the Mistake. I think someone is my friend when he really is my enemy, that I am free to marry a woman when in fact she is my mother, that this person is a chambermaid when it is a young nobleman in disguise, that this well-dressed young man is rich when he is really a penniless adventurer, or that if I do this such and such a result will follow when in fact it results in something very different. All good drama has two movements, first the making of the mistake, then the discovery that it was a mistake.
In composing his plot, the librettist has to conform to this law but, in comparison to the dramatist, he is more limited in the kinds of mistake he can use. The dramatist, for instance, procures some of his finest effects from showing how people deceive themselves. Self-deception is impossible in opera because music is immediate, not reflective; whatever is sung is the case. At most, self-deception can be suggested by having the orchestral accompaniment at variance with the singer, e.g., the jolly tripping notes which accompany Germont's approach to Violetta's deathbed in
Again, while in the spoken drama the discovery of the mistake can be a slow process and often, indeed, the more gradual it is the greater the dramatic interest, in a libretto the drama of recognition must be tropically abrupt, for music cannot exist in an atmosphere of uncertainty; song cannot walk, it can only jump.
On the other hand, the librettist need never bother his head, as the dramatist must, about probability. A credible situation in opera means a situation in which it is credible that someone should sing. A good libretto plot is a melodrama in both the strict and the conventional sense of the word; it offers as many opportunities as possible for the characters to be swept off their feet by placing them in situations which are too tragic or too fantastic for "words." No good opera plot can be sensible for people do not sing when they are feeling sensible.
The theory of "music-drama" presupposes a libretto in which there is not one sensible moment or one sensible remark: this is not only very difficult to manage, though Wagner managed it, but also extremely exhausting on both singers and the audience, neither of whom may relax for an instant.
In a libretto where there are any sensible passages, i.e., conversation not song, the theory becomes absurd. If, for furthering the action, it becomes necessary for one character to say to another "Run upstairs and fetch me a handkerchief," then there is nothing in the words, apart from their rhythm, to make one musical setting more apt than another. Wherever the choice of notes is arbitrary, the only solution is a convention, e.g.,