“If Octagrape’s music gives off a strong scent of the '90s—somewhere between the post-Stooges riffs of Mudhoney and the spilling noise-rock of Amphetamine Reptile—there’s a good reason. Singer and guitarist Glen Galloway lived in the thick of that moment, making pioneering avant-rock with Trumans Water (and later running a gamut of styles with Soul Junk). But Octagrape’s new double album Aura Obeli”