As western artists raid increasingly obscure African genres, it's fascinating to hear what comes about when the direction is reversed. On his second album, Spoek Mathambo, a South African singer-producer, ransacks metal, electro, crunk and kwaito (a slowed-down Johannesburg version of house music) to create a thrilling meltdown of global styles. Sometimes, as on "Let Them Talk", the blend is finger-snappingly fluent, but more often it is deliberately disjointed to match Mathambo's fragmented tales of township life, on the likes of the excellent "Dog to Bone".