Bach Genre is a term used to describe the musical compositions of Johann Sebastian Bach. The two most common genres associated with Bach are Fugue and ORATORIO. A Fugue is a contrapuntal composition in which a short melody or phrase is introduced by one part and successively taken up by others and developed by interweaving the parts. An ORATORIO is a large-scale musical composition for orchestra, choir, and soloists, typically on a religious theme.