This is a verbatim transcription of the Bach organ chorale prelude of the same name, but is only for professional/very accomplished players. Cello parts 1&2 are especially difficult. With skilled players it produces a wonderfully rich contrapuntal sound. The transcription was made by an organist who also happens to be a viola player. No bowings or other markings have been added, leaving these to the players discretion, but a warm legato style is called for. With less experienced players a slower tempo may be appropriate. Versions for 2 violas and 2 cellos are also available, as is a standard string quartet version - albeit in a transposed (higher) key.