(BLISS) Iceland’s Sigur Rós are generally the aural equivalent of spun sugar. Their electronic pop is airy, elegant, and unbelievably sweet—from the angelic, indiscernible vocals to the grand symphonic orchestration. Their latest release, Takk…, is no different, but adds crystalline instrumentation that breaks like icicles, murderous birdcalls, and thundering avalanches of chilling sound. (Paramount, 911 Pine St, 467-5510. $25–$35 plus fees, 8 pm, all ages.) JENNIFER MAERZ