Hell is an institution, and institutions do not traditionally thrive in dance music. This has especially been the case for the 46-year-old Helmut Geier, whose imperious presence in German techno since the 90s was matched only by a precipitous post-electroclash decline. On Teufelswerk, divided into separate Night and Day discs, Hell attempts a comeback with all guns blazing. Serious, stern epics prevail - to the detriment of the nocturnal side, which is rather self-consciously monolithic. Guest spots from Bryan Ferry and P Diddy are underwhelmingly rote, though the bursts of pizzicato strings on Wonderland are welcome relief. Emerge into daylight, though, and one is bowled over by a sequence of visions in widescreen psychedelia and gorgeous, pastoral grooves; the vocal curlicues of The Angst and the appearance of Billie Ray Martin on a cover of Hawkwind's Silver Machine are revelatory.