Registration and Ornaments of Bach’s Organ Works
It is well known how important is the rôle played in the execution of organ music by the registration, and the skilful combination of the keyboards.
Bach left but few directions upon this subject; but with their aid, and the assistance of other hints derived from tradition or found in works of that period, and by placing before the reader the specifications of the principal organs which Bach may have had at his disposal during his long career, we will try to form an idea of what Forkel calls “the exquisite art with which he combined the various registers of the organ, and his manner of treating them.”148
And our task is now the more delicate, because we cannot draw our conclusions from expressions which bore, at Bach’s time, a significance quite different from that which we ascribe to them to-day. Furthermore, we would not lay down any absolute rules in the matter, which in truth is, above all, subjective, the artistic province of the executant. We shall simply point out what Bach indicated in certain definite instances; and, on the other hand, that which was customary at his time. In fact, in authoritative works of the centuries just past, veritable methods of registration exist; and without reverting to the documentary evidence (valuable, though too concise), inserted ad hoc by Scheidt at the end of his Tabulatura nova (Hamburg, 1624), we often find, at the head of pieces written at the end of the seventeenth, or during the eighteenth century, indications of the registration to be employed; given by composers less discreet than Bach. Among the number are not a few Frenchmen, and those men not to be despised; on the contrary, we shall prove how Bach frequently borrowed from their highly picturesque art of registration. No wonder if he provoked a renewed interest in their original “mélanges.”
He copied a suite in A major by Nicolas de Grigny, organist at Rheims, and a suite in F minor by Dieupart,149 and added to them a table of twenty-nine ornaments, with their interpretation. And he was acquainted with the works of Marchand, Nivers, d’Anglebert, and particularly of François Couperin. I doubt whether the intrinsic value of these compositions, despite their entertaining nature in some cases (for instance, Couperin’s descriptive pieces), succeeded in holding his attention for any length of time; Bach could learn nothing from their technique, so often elementary; but he knew how to draw profit from their accessory qualities. Certain combinations of registers seem to us, in fact, to have been directly inspired by the study of their livres d’orgues, just as certain ornaments appear to have been borrowed from the “Agrémens” of their clavecin pieces.