text: This composer was given a theme called "Chorale St. Antoni" by the archivist of the Vienna Musikverein, which could have been written by Ignaz Pleyel.
full_question: This composer was given a theme called "Chorale St. Antoni" by the archivist of the Vienna Musikverein, which could have been written by Ignaz Pleyel. While summering in Tutzing, this composer turned that theme into "Variationen über ein Thema von Haydn", with whom the theme is traditionally associated. Although he thought it was a traditional Magyar melody, he incorporated a theme by Béla Kéler into one of his Hungarian Dances. Popularized by Clara Schumann, for ten points, name this German-Austrian composer of Academic Festival Overture and a German Requiem.
first_sentence: This composer was given a theme called "Chorale St. Antoni" by the archivist of the Vienna Musikverein, which could have been written by Ignaz Pleyel.