Dreamgirls, as a movie, seemed apologetic that it was a musical at all. Set in the Motown-ish world of a Supremes-ish girl group, the story lends itself to abundant music without straining credibility. But on the Broadway stage, the music world was only a façade – the real music came from the musical, you know, when people actually sing about how they feel.On screen, when Dreamgirls had to start singing about emotion rather than just sing, it got sheepish. Oh, please don’t mind us. We’re just going to emote for a minute. We’ll get back to the flashy editing and glitzy Beyoncé moments before you know it.That’s not how Dreamgirls should live. This is a show that needs to be seen on the stage. The touring production of Dreamgirls now at the Curran Theatre (under the auspices of SHN) – the tour that opened last year at Harlem’s famed Apollo Theatre – is dazzling in many ways, but it truly gets that this is a performance work that needs to move and sing and only stop long enough to pour on the diva moments.