The brilliant orchestrator Hector Berlioz (1803–1869) not only revolutionized the art of instrumentation; he was also a pioneer of new roles for percussion instruments. He was the first composer to include instructions in the score about the type of mallet to be used. This gave him great influence over the overall sound, because there is an enormous difference between striking the drum with a stick the head of which is covered by sponge, felt or leather or with one that is made of wood. This precise style of notation was adopted by later composers. In his requiem Grande Messe des Morts, which requires an orchestra of enormous size, Berlioz scored no less than sixteen timpani for ten players (six of whom played a pair, while the other four played one each); in his Symphonie Fantastique four timpanists are required.