Another prominent instrumental band, Russian Circles, was also strongly influenced by "Oceanic". By contrast, True Widow, whose sound is rooted as much in 1990s indie rock and psychedelic rock as in doom metal, offer a distinctive take on post-metal, most impactfully on the 2013's "Circumambulation", by employing "male/female vocal interplay" and showcasing "vulnerability and restraint". Meanwhile, the Melvins had made a direct mark on the sound they themselves inspired with the 2004 album "Pigs of the Roman Empire", a collaboration with dark ambient composer Lustmord.