After the experimental and improvisational albums of their early career 1992's "That What Is Not" could be considered a much more conventional outing. However, this series of heavy metal songs is far from ever being staid or boring! Guitarist John McGeoch's playing is second to none throughout, (listen to his glorious solos on "Emperor" and "Luck's Up" in particular.) Lydon's searing vocals are, as always, delivered with his usual lyrical inventiveness, making an album of thunderous power and intensity.