Andy Sheppard/Redferns/Getty ImagesFatoumata Diawara performs at Latitude Festival 2012 - 13/07/12 Nowadays world music encompasses everything from Pakistani psychedelia to Iranian funk to South Korea’s mega-hit “Gangnam Style.” Some artists—like India’s A.R. Rahman and Brazil’s Seu Jorge—have managed to make inroads into the American musical landscape thanks to their involvement with successful m