Perhaps the Bach Preludes show this freedom on the most liberal scale. For the Prelude is not so much a kind of form, like the Toccata, but a mere Piece before a Piece; it lays down the lines to be followed, but in itself is uncertain, unfixed in form. The Prelude may be a Toccata or a Sonata, a Symphony or an Invention; it can let its upper part, in arioso style, wander over the continuo, or it may burst forth in fullest polyphony. It may have the rhythm and regularity of beat of the dances, or may speak with the freedom of recitative without thought of a repetition. The abundance of possibilities which Bach found at his disposal in the working out of themes, construction, and style, are mirrored in the Preludes, from the real fugue to the playful method of the court-musicians.[83] Anyone who undertakes the pleasant task of simply running through the Preludes of the “Wohltemperiertes Klavier” (vol. ii.), will be able to appreciate the full spring-like freshness in which the free music of this time, so rich in promise for the future, lived out its life. And, like the discriminating observer of nature, he will admire, in just these yet unspoilt forms, the great harmony and natural unity which is exhibited by the young life of the creation. The Prelude in E major will always seem to me a blossom of this spring-time (“Wohlt. Kl.” i.)--one of the daintiest pieces ever written for the clavier. In an easy 12/8 time the poem begins with an allegretto theme, ingeniously invented, and playful in style. It is supported by two voices; but they soon take part canonically in the delightful movement. We have, in the play of cheerful thought, come to the dominant of the dominant[84] (F sharp), and from this F sharp we rest, in a humorous change, a moment on D, and even G, till, just as rapidly, we emerge through a chromatic maze at B natural once more (Bar 8). The repose of the succeeding dominant passage is gently stirred by ravishing transient modulations, on which the very spirit of happiness seems to rest. A beautiful chain of syncopations leads us through F sharp minor, and a jubilant run of semiquavers, built on a dominant chord on E, brings us to the recapitulation of the opening subject in the key of A (Bar 15), starting from which the movement repeats itself accurately (for eight bars) in its eternal cheerfulness, the piece closing with a couple of bars in Schumann’s ingenious manner, still sweetly suggesting the spring-song of its earlier strains.