On 16 April the Deutsche Welle web site reported that a long lost composition by Johann Sebastian Bach was found back among papers in a treasure chest. The papers belonged to Wilhelm Rust (1822–1892), who was the editor of Bach's first complete works.

The piece is for organ, and is a variation on an old German choral melody entitled "Wo Gott der Herr nicht bei uns hält". The "fantasy" variation takes about five to seven minutes to play

Based on its stylistic features, the piece is dated between 1705 and 1710, The copy that was now found was made by the editor Rust in 1877. It is unclear why he did not include this piece in his “Complete Works of Bach”.

[source: www.dw-world.de]