It's a pity I didn't really sink into Arrived in Gold (Load), the fourth album by this New York trio, until recently. If I'd been more aware of it while I was compiling my top-ten list of 2004 albums, it would've had a hell of a shot. Sightings play chaotic, ever-climaxing soundscape eruptions and explorations with primal simplicity but mesmerizing richness. By rights they shouldn't be able to do this with just guitar, bass, and drums, but there it is: it's like being able to hear every groaning pipe and every clang of gritty machinery in the bowels of the city and the rush of the oceans slowly eating away the shores. You could also say this album is a little, er, dancier than their others. The Coughs play second and Goldblood opens. Sun 5/29, 9:30 PM, Subterranean Cafe & Cabaret, 2011 W. North, 773-278-6600 or 800-594-8499, $8.