The hour was surely a factor, but that wasn't the only reason the crowd slowly dwindled during the 80-minute show. A Brooklyn band with roots in D.C.'s '90s art-punk scene and a strategic alliance with Osaka tribal-thump jokers the Boredoms, Gang Gang Dance can make an urgent, mesmerizing noise. But it also has a penchant for soundscapes that are more meandering than hypnotic. Over the course of its 10-year career, the group has become more groove-oriented. But the groove didn't prove any more reliable on stage than on the outfit's new album, "Eye Contact."