Rilo Kiley sheds its roots, muddles through middle

Rilo Kiley's latest album, "Under the Blacklight," is a celebration of Los Angeles' seedy underbelly, but the disc is far more surface than it is substance. This wouldn't be a problem were the band's character studies not largely characterless, composed of pop references pilfered from other bands -- some classic-rock bluster here, a bit nicked from Fleetwood Mac there. The question leading into the group's performance at the Riviera on Saturday night was largely one of context: How would the group's about-face from its indie-rock roots fare when the slick new tracks were set against the old ones?