Derek Paravicini is blind, can not tell his right hand from his left, and needs round-the-clock care. But he has an extremely rare gift—he is a musical prodigy with perfect pitch. When he hears a chord with ten notes in it, he can identify every one. Most professional musicians can get about five. He can master any melody on earth, has a databank of thousands of songs in his head and can play any one of them at will, improvising as he goes. Member of his audience asks him to play Ain’t No Sunshine. Another suggests that he play it in B major. And another, that it’s done in ragtime. No problem — without a pause, his fingers flutter across the keyboard in a hummingbird blur of staggering virtuosity.