Besim Muriqi "I am from Albania," says singer Besim Muriqi. "It's very high hills, very cold weather ... no electricity, no phone. So if you wanna call somebody you've got to sing from one mountain to another mountain. It's just communication. That's it. Communication." Juan Diego Florez Juan Diego Florez can't really explain his job as an opera singer. "To explain what you're doing," he says, "is not really possible. You know, 'What are you doing?' Well, I'm opening ... 'Opening what?' I don't know; I'm opening a little bit my throat, and then I'm placing the voice forward. 'But how?' I don't know!" Ulali On their own, the three members of Ulali have sung in bands, performed on Broadway, and been heard on television and film. Yet something drew the women to their Native American musical roots. "It's like it's within you," says Pura Fe, one of the singers. "It's almost like your ancestors come through you when you sing." The Gas House Gang The vocal harmonies of barbershop quartets have been a unique part of American folk music since the late-1800s. "Everything is geared toward getting the most resonance we possible can," says Jim Henry of the Gas House Gang. "And the more you match those four voices, the more ring you're going to get." Monks of Drepung Gomang Monastery Some say there is nothing more pure than the sound of a single note sung by the human voice. If that's true, then the singing of the Tibetan Monks of the Drepung Gomang Monastery -- who employ special vocal techniques to individually sing two and three notes at a time -- is double, even triple perfection. Ani DiFranco Talk about a woman. Ani DiFranco is a rock and roller, a coffeehouse poet, and a voice for the trials and tribulations of the human soul. Sam Moore "When I started to sing, I was about eleven," says Sam Moore. "I never knew I could sing." Yet, to Sam that wasn't as important as convincing an audience that he could sing. "I become that story in that song -- I really do. I'm like an actor on stage. I try to paint a picture for you. I just open my big mouth and I feel the story."