Succeeding his father (Johann Graf) as the composer to the Rudolstadt court, he became the Kappelmeister to Prince William of Orange and conducted a concert by Mozart and his sister. Graf had composed "Laat ons juichen, Batavieren!" which was used by Mozart to publish a set of variations in honor of the inauguration of the prince. The compositions by Graf appeared in Berlin, Paris and London as well as his native Netherlands. He was an excellent violinist who composed symphonies, concertos for violin-cello, sonatas and pieces in a number of other genres. Graf employed similar conventions in his compositions as J. S. Bach's younger sons. ~ Keith Johnson, Rovi