https://en.wikipedia.org/wiki/Toccata_and_Fugue_in_D_minor,_BWV_565
The Toccata and Fugue in D minor, BWV 565, is a piece of organ music written, according to its oldest extant sources, by Johann Sebastian Bach (1685–1750). The piece opens with a toccata section, followed by a fugue that ends in a coda.Scholars differ as to when it was composed. It could have been as early as c. 1704.Alternatively, a date as late as the 1750s has been …