V.Sofronitsky fortepiano, S.Istomin cello, fortepiano by Paul McNulty after Conrad Graf, (1782 - 1851), who held from 1824 the title of "Imperial Royal Court Fortepiano Maker" (" k. k. Hofpiano und Claviermacher").C.Graf was born in Riedlingen (Wurttemberg) and came to Vienna in 1799 as a joiner. He became a piano builder and opened his own workshop in 1804. By 1820 his instruments were considered "the greatest and most renowned in Vienna and throughout the empire." Graf not only supplied instruments to all the apartments of the imperial court but also provided a pianoforte for Ludwig van Beethoven in 1825. Chopin, Robert and Clara Schumann, Liszt, Mendelssohn and Brahms held Graf pianos in the highest esteem.