The key to an understanding of the importance of the libretto lies in the term Wagner used to describe the art-work of the future; he called this a "music-drama." The exclusive lover of music is tempted to look down on opera because its music is contaminated with drama; and for a similar reason, the exclusive lover of the drama is not attracted to opera because the drama is there more or less sacrificed to the music. But there are many opera-goers who best relish music and the drama when they are presented in conjunction. In a music-drama of the highest type, in Wagner's 'Tannhaüser,' for example, the music and the drama are Siamese twins; they were brought forth at a single birth. Each helps the other, and neither calls upon the other for any undue sacrifice. They can be enjoyed together better than they can be enjoyed apart, since each depends upon the other; and united they stand or fall.

Mr. H. T. Finck was not overstating the case when he insisted that the ideal opera is one in which the book and the score are each of them of absorbing interest, "and yet make a doubly deep impression when heard together." The stories of 'Faust' and of 'Carmen' and of 'Lohengrin' are delightful in themselves, merely to read; and a musical expert can find pleasure in playing the music from them on the piano. "Yet how much more effective they are when we hear and see music and play together on the stage." And then the same writer goes on to point out that the best "libretto is one which tells its story to the eye," as in the case of 'Carmen,' for example. "No one with eyes to see can fail, for instance, to follow the career of 'Carmen,' from her flirtation with the young officer to the scene before the bullring where he stabs her."

It was an acute French dramatic critic who once asserted that "the skeleton of every good play is a pantomime," and the assertion is more emphatically true when applied to the skeleton of a libretto. Indeed, as the words are rarely heard distinctly, and as they are often in a foreign language, there is double need of a story so clear and so straightforward that it can be caught by the eye alone from the actions and gestures and facial expressions of the performers without the aid of the actual words. But the inventing and the constructing of a plot of this seemingly simple effectiveness is a task of extraordinary difficulty—if we may judge by the infrequency of its achievement. And undoubtedly it is this difficulty which has led so many musicians to compose their scores to books only slightly altered from plays which had already an attested popularity in the theater. By so doing it has seemed to them that they were minimizing the risk of finding their music handicapped by an ineffective story. The danger in this case lies in the temptation to set to music any play which may chance to be successful without considering sufficiently whether it is really worthy of the composer's labor.

There is another disadvantage also in this snatching at successful plays to serve as opera-librettos. Most successful plays nowadays deal with modern life, and they may owe much of their success to the skill with which the dramatist has been able to seize the external aspects of reality. Now, it is an interesting question whether a realistic piece of this sort can ever supply an entirely satisfactory book for an opera, since music is emotional and idealizing. To many persons the opera seems singularly unreal, strangely remote from actual life. Such persons are shocked that Tristan, for instance, should sing for half an hour when he is dying from physical weakness. Tolstoy sided with those who take this attitude, and he had no difficulty in showing up the absurd unreality of an operatic performance, if one insists upon applying to it the standard of our ordinary existence, since we do not burst into song ordinarily to express our every-day desires. Of course, there would be no great difficulty in showing up the absurd unreality of every other art, if the same standard is insisted upon. No art can justify itself for a moment unless we are willing to admit the essential conventions which alone permit it to exist.

Tolstoy might as well have pointed out that sculpture is ridiculous, since no human being is ever all of one color, body and clothes, as a statue must be, whether it is made of marble or of bronze. He could have declared that painting is equally untrue to the mere facts of life, since it represents nature absolutely without motion, as when it depicts a field of waving corn which does not really wave but stands fixed forever. If Tolstoy or any one else refuses to accept the conventions of any art, there is no possible reply, except to make it clear to him that he is thereby depriving himself of the delight which that art can give. A departure from the mere fact underlies every art; and it is only because of that departure that the art exists. By convention, that is to say, by tacit agreement between the artist and the public, the artist is allowed to deny certain of the facts of life in order to provide the public with the specific pleasure which only his art can afford.

In the Shaksperian drama the underlying convention is that the persons of the play belong to a race of people who always express themselves poetically in English blank verse. In opera this necessary agreement requires us to concede the existence of men and women to whom song is the natural means of communicating all their sentiments and all their thoughts. If we are willing to accept this implied contract, then there is no absurdity in Tristan's singing with his dying breath, since he belongs to a race of creatures who have no other method of speech. If we are unwilling to be parties to this agreement, if we deny the existence of any such creatures, then there is nothing for us to do but to keep out of the opera-house. It was this convention which Tolstoy rejected, and by this rejection he refused the enjoyment which the opera can give to those who are satisfied to accept its conditions.

IV

But there is no denying that the imperative operatic convention requires us to admit a very violent departure from the facts of life as we all know them. We are now so accustomed to blank verse in Shakspere's plays, tragic and comic, that we accept it almost without noticing it. By long habit, we have come to consider blank verse as "natural" in a poetic play, especially when that play sets before us heroic figures of the remote past. And here is the danger in the operas which have been composed on books made out of modern popular pieces, more or less realistic in their atmosphere. The "naturalness" of the men and women in these plays of to-day tends to draw attention to the "unnaturalness" of their customary use of song to express their emotions.

This danger Wagner skilfully avoided in his later music-dramas derived from the Nibelungen myth. He set before us shadowy creatures involved in strange intrigues far back in the legendary past and wholly devoid of any modern or realistic suggestion. As Tristan and Siegfried and Brunhild are all idealized persons, taking part in poetic fictions, we are willing enough to accept their exclusive use of song; and we recognize at once the artistic inconsistency of Tolstoy's protest. To beings so remote from our daily life, from our ordinary experience, the standard of fact cannot fairly be applied. We acknowledge the full right of such creatures to dwell eternally in the land of song alone.

But we are perhaps a little less willing to make this acknowledgment when we find the composer asking us to believe that men and women of our own time and of our own country, the characters of the 'Girl of the Golden West,' for example, or even some of those of 'Madam Butterfly,' should eschew the plain prose of ordinary speech and insist on discussing their love-affairs in the obviously "unnatural" medium of song. That is to say, there is a striking incongruity between musical expression and the realistic characters of most modern plays. We enjoy the opera partly because it is not "natural," not "real," in the ordinary meaning of these words; and if the plot and the people are aggressively modern and matter-of-fact, our attention is necessarily called to the "unnaturalness" of their incessant vocalization. A certain remoteness from real life, even a certain vaporous intangibility as to time and place, seem to be a helpful element in our enjoyment of a music-drama.