But they must remember that the art of poetry is the art of heightening words by the magic of music. Colour, suggestion, philosophy, revelation, interpretation, realism, impressionism--all these qualities come and go as the fashion of our taste changes. One thing alone remains, as the essential and undying spirit of all true poetry; that it should have that "concord of sweet sounds"--let us say, rather, that concord of high, delicate, rare sounds--which melts us and enthralls us and liberates us, whatever the subject and whatever the manner or the method! Verse which is cramped and harsh and unmelodious may have its place in human history; it may have its place in human soothsaying and human interest; it has no place or lot in poetry. Individual phrases may have their magic; individual words may have their colour; individual thoughts may have their truth; individual sentences their noble rhetoric;--all this is well and right and full of profound interest. But all this is only the material, the atmosphere, the medium, the instrument. If the final result does not touch us, does not move us, does not rouse us, does not quiet us, as _music_ to our ears and our souls--it may be the voice of the prophet; it may be the voice of the charmer; it is not the voice of the immortal god. Verlaine uses the term _nuance_ in his "ars poetica" to express the evasive quality in poetry which appeals to him most and of which he himself is certainly one of the most delicate exponents; but remembering the power over us of certain sublime simplicities, remembering the power over us of certain great plangent lines in Dante and Milton, where there is no "nuance" at all, one hesitates to make this a dogmatic doctrine. But in what he says of music he is supremely right, and it is for the sake of his passionate authority on this matter--the authority of one who is certainly no formal traditionalist--that I am led to quote certain lines. They occur in "Jadis et Naguère" and are placed, appropriately enough, in the centre of the volume of Selections which I have now before me. De la musique avant toute chose, Et pour cela préfère l'Impair Plus vague et plus soluble dans l'air, Sans rien en lui qui pèse ou qui pose. Il faut aussi que tu n'ailles point Choisir tes mots sans quelque méprise: Rien de plus cher que la chanson grise Où l'Indécis au Précis se joint. Car nous voulons la Nuance encor, Pas la Couleur, rien que la nuance! Oh! la nuance seule fiance Le rêve au rêve et la flûte au cor! Fuis du plus loin la Pointe assassine, L'Esprit cruel et le Rire impur, Qui font pleurer les yeux de l'Azur, Et tout cet ail de basse cuisine! Prends l'éloquence et tords-lui sou cou! Tu feras bien, en train d'énergie De rendre un peu la Rime assagie Si Ton n'y veille, elle ira jusqu'où? . . . .