It can't come as a surprise that the Mars Volta's fourth album opens with a bang - sonic terrorism is one of the only things listeners can count on from the band - but it's genuinely novel that The Bedlam in Goliath never lets go of its momentum, not even after a full hour's worth of unrelenting war on silence, the wrapping paper for a concept album about the power of the occult. On their first three proper albums, Cedric Bixler-Zavala and Omar Rodriguez-Lopez played games of quiet-loud-quiet (or loud-quiet-loud), sneaking around stealthily for minutes at a time before detonating another blast of thrash metal riffing and piercing screams. The Bedlam in Goliath is simply loud-loud-loud, virtually every song played at maximum volume and tempo…