critti Politti is the primary vehicle for Welsh singer/songwriter Green Gartside. Few figures in pop music can claim Gartside's distinctive credentials: an artist who began in London's subcutaneous underground in the late '70s but ultimately rose to the top of the U.K. pop charts, a serious devotee of linguistic structuralism who can hold his own in a conversation with his friend, arch deconstructionist Jacques Derrida, and a handsome, dreamy-eyed gentleman who has