 Among the professionals who have been highly regarded for their virtuosity and impact on the development of the timpani in the 20th century are Saul Goodman, Hans Schnellar, Fred Hinger, and Cloyd Duff.A few solo concertos have been written for timpani, and are for timpani and orchestral accompaniment.The 18th-century composer Johann Fischer wrote a symphony for eight timpani and orchestra, which requires the solo timpanist to play eight drums simultaneously.