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Sure, on earlier recordings the band had deftly swung around some heavy riffs and wrote lyrics about Satan and other evil stuff, but Master of Reality was really Black Sabbath’s first full-on heavy metal album. And we’re all thankful: The record’s monolithic wall of previously uncharted heaviness, which focused solely on the riff, helped define doom rock as a style. So naturally, if you’re gonna have a Sabbath tribute band, you need to reference a track on that album. Enter After Forever, which will no doubt take a crack at some of those slow-and-heavy (and not much more) tunes at tonight’s doom rock showcase. Who needs melody when you’ve got the riff? After Forever plays with Place of Skulls, Life Beyond, Abdullah, Ogre, and Only the Ghost at 7 p.m. at the Velvet Lounge, 915 U St. NW. $7. (202) 462-7625. (Jacob Long)