with the 17 players Bach had at his disposal in Köthen. Concertos In the overview table, the first column shows the title, the second the key, the third the number in the Bach-Werke-Verzeichnis (BWV), the fourth the prominent instruments (solo). Concerto No. 1 in F major, BWV 1046 Title on autograph score: Concerto 1mo à 2 Corni di Caccia, 3 Hautb: è Bassono, Violino Piccolo concertato, 2 Violini, una Viola col Basso Continuo. Instrumentation: two corni da caccia (natural horns), three oboes, bassoon, violino piccolo, two violins, viola and basso continuo (harpsichord, cello, viola da gamba and/or violone) Duration: about 22 minutes The Brandenburg Concerto No. 1, BWV 1046.2 (BWV 1046), is the only one in the collection with four movements. The concerto also exists in an alternative version, Sinfonia BWV 1046.1 (formerly BWV 1046a), which appears to have been composed during Bach's years at Weimar. The Sinfonia, which lacks the third movement entirely, and the Polacca (or Poloinesse, polonaise) from the final movement, appears to have been intended as the opening of the cantata Was mir behagt, ist nur die muntre Jagd, BWV 208. This implies a date of composition possibly as early as the 1713 premiere of the cantata, although it could have been used for a subsequent revival. The first movement can also be found as the sinfonia of a later cantata Falsche Welt, dir trau ich nicht, BWV 52, but in a version without the piccolo violin that is closer to Sinfonia BWV 1046a. The third movement was used as the opening chorus of the cantata Vereinigte Zwietracht der wechselnden Saiten, BWV 207, where the horns are replaced by trumpets. Concerto No. 2 in F major, BWV 1047 Title on autograph score: Concerto 2do à 1 Tromba, 1 Flauto, 1 Hautbois, 1 Violino, concertati, è 2 Violini, 1 Viola è Violone in Ripieno col Violoncello è Basso per il Cembalo. Concertino: natural trumpet in F, recorder, oboe, violin Ripieno: two violins, viola, violone, cello and harpsichord (as basso continuo) Duration: about 13 minutes The trumpet part is still considered one of the most difficult in the entire repertoire, and was originally written for a clarino specialist, almost certainly the court trumpeter in Köthen, Johann Ludwig Schreiber. After clarino skills were lost in the eighteenth century and before the rise of the historically informed performance movement of the late twentieth century, the part was often played on