CHARLES BURNEY (1726-1814), TO WHOM WE OWE THE EDUCATIONAL MERIT OF 'DUETS FOR TWO PERFORMERS', ALSO POINTS OUT ONE OF THE DIFFICULTIES OF THAT ENTIRELY NEW GENRE: "AND ALTHOUGH AT FIRST SIGHT THE GREATER PROXIMITY OF BOTH PLAYERS' HANDS SEEMS RESTRICTING J.S. BACH: 2 GAVOTTEN - HAYDN: 2 MENUETTE - W.F.E. BACH: DREYBLATT - BEETHOVEN: TÜRKISCHER MARSCH - MENDELSSOHN BARTHOLDY: HOCHZEITSMARSCH