This device is not truly germane to the aria form. It is suggestive of the rondo in general; and in particular of the modified rondo form of the Vivaldi violin concerto, of which we know Bach made a minute study. In the splendid prelude to the third suite, in G minor, this concerto form is far more in evidence than the aria form. But the fourth, fifth, and sixth (barring the slow introduction) are like the second in superbly simple three-part aria form. This fact is well worth recollecting in connection with the development of the sonata form of a later period. The remaining movements of the suites present no irregularities. These are the dignified allemandes, the Italian or French courantes, the elusive, sad sarabandes, always one or two Intermezzi, a Gavotte, a Bourrée, a Passepied or a Minuet, and the final Gigues with their conventional contrapuntal tricks and turns. The Partitas are far less regular in structure. The opening movements are called by various names. There is a prelude for the first, short and in simple, rich style; a _Sinfonie_ for the second, with three distinct parts, suggesting the French overture; a _Fantasie_ for the third; and for the fourth, fifth, and sixth, respectively, an Overture, a Preamble, and a Toccata. The second and third have odd movements, such as a Rondo, a Caprice, a Burlesca, and a Scherzo. On the whole, in spite of the technical perfection never absent in Bach’s work, and some movements such as the closing Gigue of the first partita, these suites are inferior to the English suites. There is something tentative about the new styles of preludes and about the interpolation of freakish intermezzi, which rather mars them from the point of view of unity and balance in the cyclic forms. But the English suites stand out as magnificent specimens of vigorous and yet emotional music, great and broad in scope, perfect in detail--keyboard music which in many ways has never been surpassed. VII