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Joseph Haydn was born in 1732 and died in 1809, a period spanning the lifetimes of the elder Bach and Beethoven. During his seventy-seven years he wrote at least fifty-two keyboard sonatas, eighty-three string quartets, one hundred-eight symphonies, many masses, divertimenti for instrumental ensembles, operas, cantatas, concert!, oratorios, songs, instrumental trios, and almost as many works in other categories. It was only in 1957, after this present project had begun, that a complete catalogue of Haydn's works began to appear in print. At this writing the first of three volumes by Anthony van Hoboken has been published. Considering that Kochel 's comparable work on Mozart has been available for ninety-seven years, it is apparent that research about Haydn's work has been impaired by the lack of such a reference. This paper deals with some of the aspects of one of the major contributions ascribed to Haydn—the Sonata allegro form. For reasons to be explained later, the analysis is concentrated on the so-called second or subordinate subject. A thorough survey of the literature was undertaken, and such materials as were pertinent are quoted at the appropriate points in the thesis. To the writer's knowledge, no other work exists which deals explicitly with the problem of the second subject in Haydn's sonata-allegro form. However, he has drawn upon the studies of scholars who have investigated related problems. The sonata-allegro form is worthy of continuing investigation.

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