Robert: True appreciation of Haydn' s music demands that you hear it exactly as he intended it to be heard; that is, exactly as he heard it  Since he heard it on eighteenth-century instruments, it follows that so should we  Kari: But what makes you so sure that Haydn ever heard his music played as he had intended it to be played
After all, Haydn was writing at a time when the performer was expected, as a matter of course, not just to interpret but to modify the written score
She offers a reason to believe that one of the premises of his argument is false.