>> sakas: yeah. >> alfonsi: just hearing it once? >> sakas: yeah.kas: yeah, it is insane. >> alfonsi: yeah. >> sakas: yeah. ( laughs ) ♪ ♪ >> alfonsi: it could be exhausting? >> sakas: yeah, well it was scary more than exhausting. >> alfonsi: why scary? >> sakas: because you didn't want to blow it. because you have someone of this talent, of this creativity, this enthusiasm. you don't want to squelch that. you don't want to mess up. he's obviously, you know, got something to offer to the world, and so you want to make that possible. ♪ ♪ >> alfonsi: she did. by the time he was 11, matthew was performing around the world. his first paying gig was in capri, italy, where he cut his chops with seasoned jazz musicians. ♪ ♪ since then, he's played in more than 200 clubs and concert halls around the world. that caught the attention of doctor charles limb. limb, a musician himself, is a surgeon and neuroscienst uses m.r.i. brain scans to better understand how exceptionally creative people do what they do. what's interesting about a kid like matthew? why do y