The main goal of this study is to create a source for researchers and interpreters who would perform Ludwig van Beethoven’s first written Violoncello-Piano sonata Op. No. 1 No. 5 and his last written violoncello-piano sonata Op. 102 No. 2. In this study, innovations which Beethoven brought to violoncello-piano sonata form are identified. Information is given concerning the life and works of Ludwig van Beethoven and the influences of Beethoven on the violoncello-piano sonata form are discussed. Beethoven's cello-piano sonatas have a very important place in both instrument repertoires. This importance is undoubtedly based on Beethoven's unique musical language and the revolutionary changes which he made in the sonata form. Violoncello-piano sonatas also had their share of these changes. The present study performs a historical and structural analysis of Beethoven’s Op.5 No. 1 and Op. 102 No. 2 Violoncello-Piano Sonatas, two masterpieces of the violoncello and piano repertoire, whose comparative approach in terms of the development of the sonata form represents a part the topical concern of this study. It has been concluded that Beethoven created a unique language in sonata form and these two sonatas exercised great influences on the sonata form with an understanding of pushing the limits of both instruments technically.

Keywords: Ludwig van Beethoven, violoncello-piano, sonata