Portland, Ore.'s purveyors of avant-garde metal GRAILS return in support of their darkest and dirtiest offering yet, Doomsdayer's Holiday. The latest release details epic, instrumental riffage and atmospheres that find sludgy, metal drums intertwining with washes of Middle Eastern textures and a white-hot tussle between harmony and distortion. For their Fri., NOV. 14, show electronic music pioneers the Silver Apples surf the sine waves, carving out deep, psychedelic grooves. Led by the mysterious Simeon Coxe III, Silver Apples craft songs that are as addictive today as they were when the group emerged from the New York art-rock scene circa 1967. Athens' instrumental math rockers A.Armada open. $10. 9 p.m. Drunken Unicorn, 736 Ponce de Leon Place. www.thedrunkenunicorn.net.