One of the greatest composers of all time. Bach wrote hundreds of pieces for organ, choir, as well as many other instruments. He spent most of his life as a church organist and a choir director. His music combines profound expression with clever musico-mathematical feats, like fugues and canons in which the same melody is played against itself in various ways.
This is the duet from the very well known Cantata Wachet Auf, Ruft Uns Die Stimme ("Sleepers awake"). Arranged specially for flute by Xorys.