This well-known piece is based on a chorale by Johann Schop first published in 1642. Bach transformed it into a four-part choral composition, devising an obligato melody that has become one of his most recognizable pieces. In this arrangement for violin trio the obligato melody is transferred from one part to another in the first three voices so that all parts have the interesting melody. The chorale melody is also alternated between the three voices. A similar arrangement is available for violin quartet (20713476).