Virtuosity: what does it mean to be good? Really, really good? If you're a virtuoso pianist, violinist, cellist, does that mean you can play faster than everybody else - or better? From Liszt to Paganini, Horowitz to Lang Lang, what does it mean to be a virtuoso? Are you in league with the devil, as 19th-century critics said about the violinist Paganini, or are you able to communicate more movingly, more emotionally, more humanly than other players?