Beck's quirky brilliance is a crucial influence for just about any musician crossing alt-rock with hip-hop, like the mash-up of ecstatic soul and fidgety grooves that fuels Gnarls Barkley's “Going On.” But Beck's impact also can be felt in guitar-driven fare, as in Wilco's cosmic meditation “War On War” and St. Vincent's jagged art-rocker “Birth In Reverse.”