Claim: Bach used the BACH motif in Canonic Variations on "Vom Himmel hoch da komm' ich her" and in The Art of Fugue (an incomplete musical work of unspecified instrumentation).
Evidence: The motif also appears in the end of the fourth variation of Bach's Canonic Variations on "Vom Himmel hoch da komm' ich her", as well as in other pieces. Bach used the motif in a number of works, most famously as a fugue subject in the last Contrapunctus of The Art of Fugue. The Art of Fugue (or The Art of the Fugue; German: Die Kunst der Fuge), BWV 1080, is an incomplete musical work of unspecified instrumentation by Johann Sebastian Bach (1685–1750).