The number of measures varies across editions. There are editions with more measures than the Schirmer edition consulted by the author. Consequently, expressions such as "X measures" or "for X measures" differ depending on the edition. Therefore, measure numbers will be omitted for the first movement of this sonata. For Haydn, E-flat major was a key associated with nobility and dignity. Yet, his unique sense of humor can also be discerned within it. Fundamentally, this first movement is an optimistic and joyful movement, evoking the image of a string quartet ensemble. In sections where the music is in four voices, this image is particularly strong, so try to play with an awareness of string instruments. Both the exposition and the development sections require increasingly virtuosic playing as they approach their conclusions, with the note values becoming finer. When arpeggios and scales are written in fine triplets, a strikingly sharp performance is desirable; be careful not to play slowly or heavily. Additionally, many suspensions are written; therefore, do not emphasize the subsequent resolution notes.