Will Eastman, a DJ and a co-owner of U Street Music Hall, apologized yesterday to his club’s patrons for the action taken by a security guard during a set last weekend by the Swedish pop star Robyn.

Heavy bass and attitude might allow for some comparisons, but in thinking of Robyn and Kelis on the All Hearts Tour, let the comparisons stop there. At the 9:30 Club last night, preceded by Far East Movement and Dan Black, Kelis came with a husky alto, a sparkling silver wig, and spiked heels. Robyn had her own shock of white hair, sneakers and a slightly sweet soprano. To address a sold-out club of full of adoring fans, the ladies asked for nothing but some hands in the air and some reckless dance moves — and receive they most certainly did.