Original sentence: His biography of Haydn particularly reflects this tendency, and unlike several earlier Haydn biographers, he is generally unwilling to fill in the narrative with conjecture, particularly conjecture about how Haydn must have felt or what he must have done on some particular occasion.Webster is also an impassioned devotee of the earlier works of Haydn, and has consistently asserted his opposition to the views of Charles Rosen and others who assert a course of "progress" and learning through the composer's career.Webster's work is notable for its scholarly care, particular his willingness to sift through and assess conflicting sources of historical evidence