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.
The cello sonata was significantly impacted by its origins in continuo sonatas; even into the early 19th century, it was common for the cello to play the left hand accompaniment in these pieces, while the piano provided obbligato melodies and figurations. Beethoven is credited with composing one of the first cello sonatas with a written-out piano part.