Aside from the Piano Sonata in B-flat, op. 106, Beethoven wrote little significant music from 1815–1819. By 1820, Beethoven was well into his third compositional period, which encompassed such masterworks as the Missa Solemnis, op. 123, and the Symphony no. 9 in D Minor, op. 125. Before this, Beethoven was living in Vienna, outplaying virtually every other pianist in the city in competitions and became the darling of the Viennese aristocracy.