By now, anyone coming to Rammstein knows what to expect: lockstep beats, buzzsaw guitars, and growling German vocals, all played with stadium-sized swagger and polished with gothy sheen. Loosely based on the tragedy of Japan Airlines Flight 123, their fourth studio album offers a few curveballs, including the subdued roadhouse blues of “Los” and the wry, incisive “Amerika,” one of the only songs in their catalog to incorporate English.