Other preludes which are far more articulate, so to speak, are still fundamentally only harmonic music. So we may reckon the preludes in C-sharp major, in C-sharp minor, in E-flat minor, in G minor, in E major, in the first book. In these there is but a faint network of melody, usually contrapuntally treated, thrown over the profoundly moving harmonies underneath. Some others are little studies in fleetness or brilliancy of playing, such as those in D major and B-flat major; and still others are lyrical, suggesting Couperin, or even the Preludes of Chopin. It may be mentioned in passing that there is little internal relationship between preludes in the ‘Well-tempered Clavichord’
and the fugues which follow them. Nor is there evidence to show that the ones were composed for the others. Rather there is in many cases reason to believe that the preludes were composed often without any consideration of a fugue to follow. Still one cannot fail to observe, or rather to feel, a subtle affinity between most of the little pieces so united, which must have guided Bach in his selection and pairing.
Fac-simile of Bach's Manuscript of the Prelude in C major (Well-Tempered Clavichord).
The toccatas and the fantasias are on a much broader plan than the preludes. The former are essentially impressive, if not show pieces. They are usually built up upon a series of brilliant runs, oftenest scales or close arpeggios, with slower moving passages of chords and contrapuntal weavings scattered here and there. The fantasias are, as the name implies, quite free and irregular in form. Both fantasias and toccatas are for the most part distinctly in organ style. Their glory is, like the beauty of the preludes, a glory of harmony. The long, rapid runs may have lost their power to thrill ears that have heard the studies of Liszt; but the chords which lie under them have a majesty that seems to defy time.
There are several ‘concertos’ and ‘sonatas’ of which to say much is to repeat what has already been said of other forms of his music. Both are obviously indebted to Vivaldi for style, or the external features of style, as well as for form.
The idea of the concerto in Bach’s day was not the idea which Mozart planted firmly in the mind of musicians. To show off the special qualities of the harpsichord against the background of an orchestra is not often evident as a purpose in Bach’s concertos. He wrote for the harpsichord much as he wrote for the orchestra; or for the orchestra as he wrote for the harpsichord. To the solo instrument he allotted passages which required a fineness in execution of details, or passages which he wished to be softer than the general run of the music. There is a clear intention to get contrast between the group of instruments and the solo instrument, but apparently little to write for the two in a distinct style.
One may take the D minor concerto for harpsichord and a group of instruments, or even better, the Italian Concerto, for a single harpsichord, preferably with two manuals, as the perfect type. The arrangement and number of movements is well worth noticing. There are three, of which the first and last are in the same key and of about the same length and style. The middle movement is in a contrasting key, is shorter and nearly lyric in character. The scheme is perfectly balanced as a whole, and, it will be noticed, shows little kinship with the suite.
The first and last movements are in the same rapid tempo and both are treated contrapuntally throughout. Their internal structure is fundamentally tri-partite, like the fugues and the preludes in the English suites, the opening and closing sections being the same. The middle section brings out new material, but also retains suggestions of that already announced; the new material tending to take on an episodic character, like the couplets in Couperin’s rondos. This is unusually clear in the middle section of the last movement of the Italian Concerto, in which there are three very distinct episodes, one of which appears twice, quite after the manner of the Beethoven rondo. But one feature, which Bach probably acquired from Vivaldi, makes the whole procedure different from Couperin’s. This is that the main theme, either the short or long part of it which may be restated between the episodes, appears in different keys. The same feature is evident in the preludes to the English suites.
The slow movements in both the D minor and the Italian concertos are written upon a favorite plan of Bach’s. The bass repeats a certain form or ground over and over again, above which the treble spins an ever varied, rhapsodical melody, highly ornate in character. The plan is an exceedingly simple and a very old one. It may be traced in the old motets of the mensuralists of the thirteenth century, with their droning ordines; and in the favorite ‘divisions’ of the early English composers. The Chaconne and the Passacaglia are but variants from the same root. It is, of course, a simple form of variations.
This leads us, at last, to a brief consideration of what is perhaps from the point of view of the pianist, if not indeed from that of the musician, the most astonishing of Bach’s harpsichord music,—the Goldberg Variations. The story of their origin will bear repetition for the light it throws on the mood in which they were written.