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. [Footnote 149: Dieupart, born in France during the last third of the seventeenth century, was a remarkable violinist and clavecinist. He went to England early in the eighteenth century, and, associated with Clayton, introduced Italian opera at Drury Lane. After disasters similar to those which later befell Händel, he renounced the theatre and busied himself no longer with instrumental music. He died in 1740. Of his compositions are extant: Six suites for the clavecin, divided into Overtures, Allemandes, Courantes, Sarabandes, Gavottes, Minuets, Rondos, and Gigues, composed and arranged for concert performance by a Violin and a Flute, with a Bass Viol and an Archilute. (See Grove's "Dictionary of Music and Musicians.") The prelude of Bach's first English Suite was inspired by a passage in the _A_ major suite of Dieupart.] I