These present Chopin's virtuosic technique to the highest degree. The composer derived his model from classical Viennese and the fashionable stile brillant compositions. Personal experience related to the concert practice of improvisation on given themes also had a decisive influence. Themes for Chopin's variations come from the song and opera repertoire. Allegro de Concerto A-Dur op 46Variations sur un air national allemandVariations brillantes sur le rondeau favori op 12Souvenir de PaganiniVariation sur le marche des puritains de Bellini / Piano / Pwm