Toccata and Fugue in D Minor, BWV 565: I. (Toccata.) Adagio

This is a piece of organ music believed to be composed by Bach sometime in the middle of the first decade of the 18th century. It is one of the most famous works in the organ repertoire.

The attribution of the piece to Bach has been challenged since the 1980s by a number of scholars for stylistic reasons. However as no definite name has cropped up as the piece's composer, it is still usually listed under Bach's name.

It is believed that this piece was almost certainly not conceived for the organ and was probably originally written for the violin.