Carl Maria Friedrich Ernst von Weber was a German composer, conductor, pianist, guitarist and critic, one of the first significant composers of the Romantic school. Weber's operas Der Freischütz, Euryanthe and Oberon greatly influenced the development of the Romantic opera in Germany. His compositions for the clarinet, which include two concertos, a concertino, a quintet and a duo concertante, are regularly performed today. His piano music—including four sonatas, two concertos and the Konzertstück (Concert Piece) in F minor—influenced composers such as Frédéric Chopin, Franz Liszt and Felix Mendelssohn. The Konzertstück provided a new model for the one-movement concerto in several contrasting sections (such as Liszt's, who often played the work), and was acknowledged by Igor Stravinsky as the model for his Capriccio for Piano and Orchestra.