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Published on May 3, 2007
The 'Kunst der Fuge' is Bach's testimony to the various types of counterpoint and canon, written at the end of his life (unfinished). Contrapunctus IX is a 4-voice 'double fugue at double counterpoint at the twelfth'. 'Double' in the sense that one tune is added to the main tune, 'counterpoint at the twelfth' indicating that the new tune can be placed a twelfth (octave and fifth) either below or above the main theme.