Single-mindedness can be a virtue. In art, variety and creativity is often praised above all else. But there is also value to be found in iteration. Some creators excel by finding a few component parts they favor and exploring their every possible permutation. Japanese grindcore band Mortify is the fruit borne from such single-minded iteration. Self-described as "Swedish HM-2 buzzsaw grindcore," the band melds the iconic tone of the Boss HM-2 guitar pedal (known for its use in 90s Swedish death metal) with vocals that alternate be…