Oscar Hammerstein II’s adaptation of Georges Bizet’s 1875 opera Carmen into a musical, Carmen Jones, is rarely staged, so the revival at Classic Stage Company production is a happy resurrection of his 1943 effort. Nonetheless, although it is gloriously sung, the 90-minute production doesn’t make a case that Hammerstein’s musical theater version is the equal of Bizet’s opera. It’s never going to be in the standard repertory.