Gareth Malone launches a nationwide contest, paying tribute to the homemade, passionate energy of local choirs and singing groups - pushing competitors to their very limits whilst celebrating their individuality and origins.

To seek out the very best and pose the ultimate test of vocal dexterity, creativity and ingenuity, Gareth is stipulating that each group must rely solely on the versatility of their voices and perform a cappella - without backing tracks or musical instruments. From doo wop to hip hop, glorious gospel groups to barbershop quartets, Gareth is looking for the highest standards of musicianship and technical ability: but he’ll also encourage spectacular and witty performances, the kinds of choreography and gymnastics that turn groups into YouTube stars. 

The Naked Choir with Gareth Malone begins 22/09/2015 at 9pm on BBC Two.