If you need to top off your tank come Sunday, this Louisvillian-riddled bill at The High Watt is your station for a dose of the heavy, mind-expanding stuff. Locals The GoldRoom make severe, angular guitar rock inspired by ’80s and ’90s college- and indie-rock outfits like Pixies, Dino Jr., Chavez and Shellac, while the ever-epic Ascent of Everest long ago planted their flag in Post-Rock Mountain, securing their position as the kings (and queens, when their string players are around) of Nashville’s ambient experimental-rock heap. Representing Louisville’s noted post-rock scene will be Parlour, Shedding and Old Baby. While between them only Old Baby features much in the way of discernible lyrics (check out their tune “Pale as Man” for some dirty, brainy, Grinderman-esque rock), all three outfits explore melody and instrumentation in a dense, moody manner. Prepare for a night that will vacillate between real, visceral rock tunes and far-out, experimental soundscapes.