Piano and cello are given equal roles in the sonata in a (Op. 69), a break with the 18th-century format of a piano sonata accompanied by an instrumental obbligato.

作品69号A调奏鸣曲中，钢琴与大提琴平分秋色，这种方式打破了18世纪以前钢琴奏鸣曲中，其他器乐占次要角色的布局。