Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Setting new standards for heavy rock

Sweden's Mammoth Volume most often gets lumped in with the so-called stoner rock bands, and perhaps their first two albums justify the categorization. But this, their third album, reveals the quartet to be a band pushing the envelope of what a supposedly retro heavy rock band can do, not unlike Queens of the Stone Age. Sure, they can dig into a very Kyuss-like groove now and again ("Vipera Berus," "K") but they're just as comfortable with acoustic psychedelia ("Aum") and even prog ("To Gloria," "What Happened to Antioch?"). Guitarist Daniel Gustafsson is much more interested in feel and atmosphere than in fancy solos, though he can do that too; he also drops in mellotron and flute where he feels they're appropriate. Mammoth Volume doesn't beat the listener over the head with obvious riffs, but instead follows its own idiosyncratic path, trusting in the listener to follow. Do so and you'll be rewarded.