19th-century Norwegian violinist Ole Bull was compared to which celebrated Italian virtuoso of the time?
Ole Bull:  According to Robert Schumann, he was on a level with Niccolò Paganini for the speed and clarity of his playing. Niccolò Paganini: Niccolò (or Nicolò) Paganini (] ; 27 October 178227 May 1840) was an Italian violinist, violist, guitarist, and composer. Niccolò Paganini:  He was the most celebrated violin virtuoso of his time, and left his mark as one of the pillars of modern violin technique.
Niccolò Paganini