The “hybrid theory” Linkin Park introduced back in 2000 has evolved. Songs like "The Catalyst" showcase something more majestic, less tied to hip-hop, and exponentially more symphonic. The components that make Linkin Park one of the new millennium's biggest rock bands — the piano-based heartbeat, the chainsaw-guitar roar, the synth and drum machine pyrotechnics, the Mike Shinoda and Chester Bennington throat-shredding interplay — are magnified on this album co-produced by Rick Rubin and Mike Shinoda.