UMUR "Devolution" is the 4th full-length studio album by US crossover thrash metal act M.O.D.. The album was released through Music for Nations in June 1994. It´s the successor to "Rhythm of Fear" from 1992 and features two lineup changes since the predecessor as guitarist Tim McMurtrie has been replaced by Tom Klimchuck, and bassist Rob Moschetti has been added to the lineup (lead vocalist Billy Milano handled both vocals and bass on the predecessor), making M.O.D. a four-piece on "Devolution".

Stylistically the material on "Devolution" continue the heavy groove laden crossover/hardcore style of "Rhythm of Fear (1992)". There are faster paced crossover/hardcore tracks on the album too, but the tempo is predominantly mid-paced and the tracks heavy and groove laden. Milano has a raw voice and an aggressive delivery and he is complimented here by new bassist Moschetti, who also sings some vocals on the album. Often in a sort of call and response type manner. Moschetti also has a raw hardcore type voice and delivery.

The material is relatively well written, effectful, and raw, although it´s not the most memorable nor the most standout crossover/hardcore tracks you´ll ever hear. It´s delivered by seasoned professionals though, and the music is packed in a powerful and well sounding production too, so upon conclusion "Devolution" is another decent quality release by M.O.D.. A 3 - 3.5 star (65%) rating is warranted.