A day after Matt Reeves' The Batman announced Paul Dano, the most Riddler-looking motherf*cker alive, would play The Riddler, the latest Dark Knight tale added yet another big name to the crew. During a concert at Royal Albert Hall in London, England, Oscar-winner Michael Giacchino accepted Reeves' offer to join the film as composer. Warner Bros. hasn't officially announced the news, but the update comes courtesy of Cinema Savvy, who had eyes in the crowd. Matt Reeves came out during the concert and asked Michael Giacchino to compose the Batman film!!! Witnessed at the Royal Albert …