As if their dark lyrics and wall-of-sludge sound didn't already have an epic sweep, Black Sabbath braved an even more ambitious approach on Sabbath Bloody Sabbath, adding synthesizers and even strings to tracks such as "Who Are You?" and "Spiral Architect." But even without them, the Sabbath classics "Killing Yourself to Live," "National Acrobat," "Looking for Today," and the title track pack a thunderous sonic wallop. "Fluff," a bit of ponderous musing on acoustic guitar and keyboards, adds variety to the disc but brings the headbanging pleasure of the rest of the album to a screeching halt. Beyond that misstep, Sabbath Bloody Sabbath is as slow and deliberate as a lava flow, and just as powerful. --Daniel Durchholz