Representing multiple generations and branches of the oft-incestuous stoner/sludge/doom-metal family tree, this Quaalude-simulating quartet of hirsute heavyweights will keep it low, slow and likely painfully loud all night long. Originally a spinoff of early genre architects Buzzoven, Weedeater’s grizzled, Southern-accented sludge is delivered with almost incongruously good humor, as the North Carolina trio prove capable of simultaneously partying both hearty and heavy. Recently reunited for a third time, Maryland vets The Obsessed offer an accessible portal into doom metal, flying much closer to Black Sabbath and straight-out heavy metal than many of their (comparatively) come-lately kindred spirits. Relative whippersnappers Primitive Man, only formed in 2012 but furiously prolific, bring bile and bite to their distinctively noisy doom. Widely revered as godfathers of desert rock, openers Fatso Jetson deliver a nuanced take on a sound popularized by Queens of the Stone Age.