The U.K.’s Dutton Vocalion label is continuing its ongoing campaign reissuing quadraphonic albums on hybrid SACD (with a stereo layer playable on all CD players) with two classic Broadway cast recordings from the Columbia vaults.  Both were choreographed by Michael Bennett, feature the talents of Donna McKechnie, and have orchestrations by Jonathan Tunick.  Moreover, both merged classic Broadway with a powerful and contemporary sensibility. Much as Rodgers and Hammerstein had done before him, when they first masterfully integrated songs, dance, and dialogue into a dramatic whole, Stephen Sondheim would inaugurate his own…