Mozart composed 17 piano sonatas, 6 violin sonatas and 35 piano violin sonatas. It contributed to the development of classical sonata suite and laid the foundation for the three-movement suite in Vienna classical style. In the piano sonata, he and Haydn completed the transition from harpsichord style to piano style together. He especially likes writing for the piano. Piano sonatas in the 1980s brought the effect and range of the piano to the extreme, such as piano sonatas in A major (K.33K.457+0, K.475+0781-kloc-0/783) and piano sonatas in C minor (K.457, 1783). Among them, K.33 1 embodies the custom characteristics of music, and the last two songs show sharp contrast and juxtaposition and dramatic power, which indicates the birth of Beethoven's piano sonata.