Chorale Prelude 'Wo soll ich fliehen hin', BWV 646

The Six Chorales of Various Kinds (Sechs Chorale von verschiedener Art) is a collection of chorale preludes for organ written by Johann Sebastian Bach, and published around 1748. They are commonly nicknamed Schübler Chorales, in reference to the publisher Johann Georg Schübler. All six of the preludes are for an organ with two manuals and pedal, at least five of them transcribed from movements in Bach's cantatas, mostly chorale cantatas.

Another Schübler Chorale:
http://www.contrebombarde.com/concerthall/music/14335