Beethoven's musical style
The compositions that Beethoven wrote in his formative period can be generally characterized by the composer's efforts to master the predominant classical language of the period. His works from this period can be subdivided into two, based on the composer's residence. First, various juvenalia, written when the adolescent Beethoven was in residence in Bonn and heavily indebted to the works of contemporaries, especially Mozart and his teacher, Christian Gottlob Neefe. These early efforts can be seen in a set of three piano sonatas and piano quartets (WoO 36) that Beethoven wrote before 1792. The Quartets, for instance, are each specifically modelled after three Violin sonatas Mozart published in 1781 – K 296, 379 and 380 – and Beethoven would later draw upon this familiarity in the composition of several of his own Violin Sonatas.
Cello Sonatas Nos. 1 and 2 (Beethoven)
In the early 19th century, sonatas for piano and instrument were usually advertised as piano sonatas with instrumental accompaniment. Beethoven's first violin sonatas, for instance, were published as "sonatas for piano with accompaniment by the violin." The cello sonata was especially so plagued, as it grew out of sonatas for continuo; as late as the beginning of the 19th century it was still common for the cello in cello sonatas to double the left hand of the piano part, with the piano right hand playing "obbligato" figurations and melodies. Beethoven, indeed, is credited with composing one of the first cello sonatas with a written-out piano part.