In 1849, Schumann turned to a new genre: the composition of works for piano accompanied by a solo instrument. Almost systematically, he gave Fantasiestücken, Romanzen, etc. to different wind instruments - and always also anticipates a variant with a string instrument. Thus, according to his wish, the Adagio and Allegro op. 70 also exists in a version for piano and cello. Clara played the new work, accompanied by the horn player E. Julius Schlitterlau, then reporting in her diary: "The work is superb, very fresh and passionate, as I love them so much!" Enthusiastic, Schumann also proclaimed "having had a lot of fun", which is why many musicians still join him today.