Johann Sebastian Bach (21 March 1685, O.S.31 March 1685, N.S. – 28 July 1750, N.S.) was a German composer, organist, harpsichordist, violist, and violinist whose sacred and secular works for choir, orchestra, and solo instruments drew together the strands of the Baroque period and brought it to its ultimate maturity. Although he did not introduce new forms, he enriched the prevailing German style with a robust contrapuntal technique, an unrivalled control of harmonic and motivic organisation, and the adaptation of rhythms, forms and textures from abroad, particularly from Italy and France.

The Toccata and Fugue in D minor, BWV 565, is a piece of organ music attributed to Johann Sebastian Bach. It is one of the most famous works in the organ repertoire.