His compositions are believed to have led to the development of the sonata form. This was still evident at the end of his career. The Piano Sonata No. 62 in E flat major (Hob. XVI:52) consists of short, balanced melodic phrases of two, four or sometimes six bars. Each melody of the exposition is equally divided into an antecedent phrase and a consequent phrase; question and answer. This is a typical feature of the classical period which was obsessed with clarity of structure. Likewise, the Piano Sonata no. Beethoven's 1 in F minor op. 2, no. 1 is clearly divided into exposition, development and recapitulation. His lucid exposition of melodic material occurs in balanced melodic phrases. Both of these works contain short codas for each section. The fact that Beethoven's sonata was written a year after Haydn's, while he was still a student of Haydn, highlights Haydn's influence on Beethoven during the initial phase of his