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
Horn Concertos (Mozart) or 1786 (Humphries 2000, 87). Given the duration of the concertos (no more than 20 minutes each) it is quite common to find these horn concertos on the same CD, or in boxed sets of Mozart's concertos for wind instruments or even all his concertos. The Naxos Records CD "Complete Works for Horn & Orchestra" includes, besides the concertos, three rondos for horn and orchestra completed by musicologists. When a CD has only one of the horn concertos, it is typically paired with another concerto for a wind instrument also by Mozart. Horn Concertos (Mozart) The Horn Concertos by Wolfgang