Linkin Park wasn’t supposed to still be around. Appearing on the scene in 2000, the band barely distinguished itself from its contemporaries in rap-rock, the harsh hybrid of rage and rhyme that ruled the airwaves at the turn the century with chart-topping and aptly named bands like Korn and Limp Bizkit. But Linkin Park possesses commercial instincts the others didn’t. From the 2000 debut of “Hybrid Theory,” a multiplatinum cash cow whose liner notes started a band tradition of providing lengthy product endorsements, through a new album, the kinder and gentler “A Thousand Suns,” Linkin Park has sought to express its angst, sure, but always just within the confines of what sells....