this is a very lightweight bike. >> reporter: lebo is a polio survivor. right leg is almost completely powerless, yet somehow after numerous falls and getting up again, she trained herself how to pedal down the road and climb hills using only her left leg. >> still got it. my right leg is just tagging along. >> reporter: just tagging along for sometimes epic rides. a few years ago she completed a 102-mile loop around the eastern sierra. it took her more than 11 hours, but she finished. >> i think everybody has so much potential in them and a lot of people underestimated their own potential. you got a lot in you. you got to dig, dig deeper. >> reporter: lebo has been digging deeper her entire life. she was born in rural china and at 11 months old got polio which affected her right leg. she can walk with the help of a leg brace designed to help military veterans come back from battlefield injuries. >> as far as i can remember, i was walking with a limp. so that's basically the polio effect on me. i can only imagine why you're different in any way. life can

sung by lebo m., a south african musician, who was working at a car wash in los angeles when hans enlistedame about, literally. microphone in the room, not in a booth or anything like this. >> hans told the executives at disney that he wanted to say right off the bat this is not a typical disney movie, it's a father/son story that takes place in africa. >> and they said, "exactly. that's good. do -- do what -- do what you do." >> he showed us what he does at his studio in los angeles, where he composes his scores on this keyboard and computer. for example, the music for the first "pirates of the caribbean" movie. >> so, if you have "pirates," which is basically this sort of a thing, there's a jauntiness, right -- ♪ >> yeah. >> and it's -- the music is really big. anand he's in a a little rowowb wiwith a little sail, and you hr this huge orchestra. because that's thehe music he hears in the -- in his head, because he's the greatest pirate that has ever lived in his imagination. so, when you listen to the joker, he's quite the opposite. it's like, you know, a bow on a bow and arrow. and you