The Art of Fugue (or The Art of the Fugue; German: Die Kunst der Fuge), BWV 1080, is an incomplete work of unspecified instrumentation by Johann Sebastian Bach (1685–1750). Written in the last decade of his life, The Art of Fugue is the culmination of Bach’s experimentation with monothematic instrumental works. It consists of 14 fugues and 4 canons, each using some variation of a single principal subject, and generally ordered to increase in complexity.