About Johann Sebastian Bach's Concertos
Bach’s concertos for keyboard instruments are among the first such works ever written. From 1729 to 1741 the composer was director of the Collegium musicum in Leipzig, a musical society founded by Telemann, often giving concerts at Zimmermann´s coffee-house.
It was for occasions such as these that Bach produced his harpsichord concertos.
There are concertos for one, two, three or four harpsichords; many of them are thought to be arrangements of earlier concertos for other instruments.