Debuting as a post-Metallica thrash outfit with 1991’s Contradictions Collapse, Sweden’s Meshuggah have been refining their intractable sound to a serene balance of pummeling death metal and intricate technical sophistication. Fittingly, their latest record is called obZen, and for much of its hour-plus running time, the album does in fact bring a sense of zen-like calm to its brutally complex compositions....