A doco about these guys is showing at Cannes this year

From Wiki;

Staff Benda Bilili are a group of Congolese street musicians. They live around the grounds of the zoo in Kinshasa, and play music which is rooted in rumba, with elements of old-school rhythm'n'bluesr and reggae. The core of the band consists of four senior singers/guitarist, who are all disabled (they suffered from poliomyelitis when they were young) and move around in spectacularly customized tricycles. They are backed by a younger rhythm section consisting of ex-sheges, abandoned street kids who were taken under the protection of the older members of the band. The soloist is an 18 year-old boy who plays guitar-like solos on an electrified one-stringed lute he designed and built himself out of a tin can.