The virtues of LCD Soundsystem — a surgeon's attention to detail, the pleasure of a slow-burning bass groove — are ageless. "This Is Happening," the third and reportedly final LCD Soundsystem record, perfectly executes James Murphy's inimitable ideas for disco-rooted rock. But his sense of emotional grandeur has settled down a bit. Instead, "This Is Happening" brims with smaller joys: the contrast between the wafer-dry vocal harmonies and funk-sopping synth bass on "Dance Yrself Clean" and the cut-rate laser noises on the calisthenic banger "Pow Pow." With Hot Chip and Sleigh Bells. Hollywood Bowl, 2301 N. Highland Ave., Hollywood. 7 p.m. Fri. $23.80-$93.75. (323) 850-2000.