Like everything else he does, musical iconoclast David Sylvian's idea of a retrospective compilation is very different from the norm. Sleepwalkers is a 16-track, hour-plus collection focused on his many collaborations during the previous decade. Included are alternate takes from his own albums, remixes, reworked material and his contributions to the albums of others. There is one new cut, pointing to the future: "Five Lines" with Japanese composer Dai Fujikura, is a complex art song with a string quartet. (According to Sylvian, Fujikura is working with him on a completely new, orchestral version of Manofon.) This new piece is one of the many highlights.