282 There are, in fact, three Concertos for two Claviers and Orchestra: two in C minor and one in C major. Forkel refers to only one of the former and regards it as antiquated by comparison with the one in C major. Spitta (iii. 144) attributes the C major to 1730. Forkel’s C minor in its original form was a Concerto for two Violins, now lost. The other C minor Concerto is identical with the Concerto in D minor for two Violins and is in P. 257b. Spitta (iii. 138) dates it 1736. See Schweitzer, i. 413. 283 In D minor and C major (P. bks. 258, 259). The tradition is that Bach wrote these two Concertos in order to play them with his elder sons. Spitta (iii. 144) finds the tradition trustworthy. Hence the two works must have been written by c. 1733 at latest, before the sons left home. See also Schweitzer, i. 414. 284 In A minor (P. bk. 260). This is not an original composition, but is an arrangement by Bach of a Vivaldi Concerto for four Violins. Spitta (iii. 149) assigns it to the same period as the Concertos for three Claviers, c. 1733. See B.G. XLIII. (1) infra. 285 The pedal on the small German Organ had only the compass of an octave. 286 The Great Preludes and Fugues are, with one exception, in B.G. XV. The Prelude and Fugue in E flat was published by Bach in the third Part of the _Clavierübung._ Its Fugue is known as the “St. Anne’s.” 287 From the figures printed by Forkel the twelve can be identified as follows (the references in parentheses are to the Novello edition of Bach’s Organ works): Prelude and Fugue in C minor, the “Great” (bk. vii. 64). Prelude and Fugue in A minor, (bk. vii. 42). Prelude and Fugue in G major, (bk. viii. 112). Prelude and Fugue in E minor, (bk. viii. 98). Prelude and Fugue in B minor, (vii. 52). Prelude and Fugue in C major, (bk. ix. 156). Prelude and Fugue in D minor, (bk. ix. 150). Prelude and Fugue in C major (bk iii. 70). Tocatta and Fugue in D minor (bk. x. 196). Tocatta and Fugue in F major (bk. ix. 176). Prelude and Fugue in G minor (bk. viii. 120). Prelude and Fugue in E minor (bk. ii. 44). 288 The Passacaglia in C minor (Novello bk. 10 p. 214) was written originally for the Clavicembalo and pedal. It belongs to the later Weimar period, i.e. circ. 1715. See Spitta, i. 588 and Schweitzer, i. 280.