Released on Testament's 1999 album The Gathering, 'D.N.R. (Do Not Resuscitate)' stands as a defining track in the band's evolution from thrash metal to progressive death metal. The song features the band's signature dual-guitar harmonies and complex time signatures, showcasing the technical prowess of guitarist Scott Travis. Thematically, the title references the medical procedure, a subject often explored in the band's catalog to reflect on mortality and the human condition. This recording solidified Testament's reputation as a major force in the death metal genre during the late 1990s, blending aggressive riffs with melodic sensibilities that influenced countless subsequent acts. It remains a staple of their discography, representing a pivotal moment where the group balanced speed with atmospheric depth.