BACK IN STOCK!!! Received a 7.3 rating from Pitchfork. It’s been nearly four years since the last Mammoth Grinder full-length, Extinction of Humanity, was released via Relapse Records (CD) and Cyclopean Records (vinyl). That album showcased the band’s direction into a distinctly death metal permutation, full of aggression and punk rawness, and they continued in this spirit on 2011’s split LP with fellow Austin, Texas-based group Hatred Surge. Now, after a long wait and much anticipation, Mammoth Grinder has found a home on 20 Buck Spin for the release of their wildly destructive third full-length Underworlds.The album marks a peak at which Mammoth Grinder have sharpened and perfected their sound into a seething grind / death / thrash maelstrom of intense degree. Unrelenting in concentrated raw precision and focused power, Underworlds careens violently through ten tracks with effortless versatility and the fixated songcraft expected of a band on their third record. Tracks like “Wraparound Eyes” with its Unleashed-style midsection, or the short sharp shock of “Paragon Pusher,” illustrate Mammoth Grinder’s mastery over multiple variations of metal to assemble their own sound. Underworlds is adorned with artwork by the legendary Joe Petagno, whose work has graced albums from artists like Pink Floyd and Led Zeppelin to Motörhead and Marduk.Mammoth Grinder is a live act and that is where the songs on Underworlds will expose their most virulent strain—the band has plans to tour extensively upon the album’s release, including an appearance at this year’s Power of the Riff festival.