4.0 + The Yeah Yeah Yeahs blazed in on a wave of media buzz back in the early aughts so it’s strange to think that they now seem relegated to a mere footnote within that Brooklyn-DIY-indie scene. On hindsight, Karen O's stage persona always smacked of performance art, overly ironic with little heartfelt emotion to draw in the listener (note two exceptions: “Maps” and “Modern Romance”). That said, I do adore Nick Zinner’s guitar sound, a rainbow colored chainsaw.