Although this Kentucky combo had a short lifespan, its influence has been extraordinary, presaging the underground "math-rock" revolution and spawning spinoffs such as Tortoise and Gastr Del Sol. But don't go thinking that the foursome is a mere footnote: The bracingly dense, dizzyingly complex songs that vein this, their second full-length release, perfectly capture the smarter face of early-'90s thug-rock. Yes, Slint's sound is descended from punk, but its members--particularly guitarist Brian McMahan--never subscribed to the "keep it simple, stupid" philosophy. Spiderland is so rife with breakneck tempo changes, off-kilter chord progressions, and bizarro-world themes, you'd be hard-pressed to go a listen without discovering something new.