Keyboard concertos by Johann Sebastian Bach soloists, were all adapted into harpsichord concertos by the composer, BWV 1058, 1054 and 1062 respectively. It is often assumed that Bach's extant violin concertos were written in his Köthen period (1717–1723): it can however not be proven from documentary evidence that any of them existed prior to around 1730. In September 1725 Bach performed organ music, accompanied by other instruments, in Dresden. The works he performed there have not been identified. More than a year later he composed several cantatas with an organ obligato part. Several movements of such cantatas were derived from earlier lost concertos, and resurfaced in
Strathclyde Concertos of the "Strathclyde Concertos", Davies increased the number of soloists. The Ninth (1994) is scored for six woodwind soloists, while the Tenth (1996) is a concerto for orchestra whose finale is a sort of recapitulation of ideas heard in the earlier concertos. The first two concertos were recorded by Unicorn-Kanchana, with the composer conducting. The remainder were recorded by Collins Classics. This concerto is based on two pre-existent works: Haydn's overture "L'isola disabitata" and a two-part setting of the opening line of Ecclesiastes, "Vanitas vanitatum et omnia vanitas" by the early seventeenth-century composer Jan Albert Ban. Strathclyde Concertos The Strathclyde