Franz Liszt created six piano etudes based on works by this man, including "La Campanella." This man commissioned Berlioz's Harold in Italy, but refused to play it because there were too many rests. His twenty-fourth caprice in A minor served as the basis for both Brahms's books of Variations named after this man and Rachmaninoff's (*) Rhapsody on 
Franz Liszt created six piano etudes based on works by this man, including "La Campanella." This man commissioned Berlioz's Harold in Italy, but refused to play it because there were too many rests. His twenty-fourth caprice in A minor served as the basis for both Brahms's books of Variations named after this man and Rachmaninoff's (*) Rhapsody on a Theme of this man. This man's ability was later attributed to Ehlers-Danlos syndrome, which increases joint flexibility, rather than a deal with the Devil. For 10 points, name this legendary nineteenth century Italian violin virtuoso.
Franz Liszt created six piano etudes based on works by this man, including "La Campanella.
Nicolo {Paganini} [or Niccolo Paganini]