Washington, D.C.'s Periphery push at the boundaries of progressive metal, utilizing detuned, extended-range instruments to create a sound that's as technically dizzying as it is relentlessly heavy. Using a framework laid down by djent pioneers like Meshuggah and running wild with it, the group issued an eponymous debut in 2010. Periphery hit their stride with the double-LP Juggernaut (2015) and the diverse Periphery III: Select Difficulty (2016), the latter of which earned them a Grammy nomination for Best Metal Performance. The band elicited accolades on subsequent efforts, P...