More than four decades after its Broadway debut, the Roundabout Theatre's 2007 revival of110 in the Shadeis a glorious showcase for soprano Audra McDonald, and an eloquent statement for an underrated and neglected work.  Based on N. Richard Nash's playThe Rainmaker,110 in the Shadetells the story of a Texas town stuck in a blistering heat wave.  Lizzie (McDonald), the daughter of a local widower (Broadway veteran and TV star John Cullum), has resisted all suitors, including the sheriff (Christopher Innvar), until a potential huckster named Starbuck (Steve Kazee) arrives in town promising to bring rain ("The Rain Song").  Just like Marian the librarian, Lizzie thinks she sees right through the scam ("You're Not Fooling Me").  McDonald shines in her solos ("Love, Don't Turn Away," "Old Maid"), but Cullum, Innvar, and Kazee also get their moments either in duets with McDonald ("A Man and a Woman," "Simple Little Things," "Is It Really Me?") or by themselves.110 in the Shadeis obscure compared to Tom Jones and Harvey Schmidt's most famous work,The Fantasticks--none of its songs ever entered the popular culture like "Try to Remember"--but it's a beautiful, evocative score that is tailor-made for McDonald's rich voice.  It's also much more sumptuous thanThe Fantasticks, even in Jonathan Tunick's pared-down, Tony-nominated orchestrations.  (Also nominated were McDonald, Cullum, lighting designer Christopher Akerlind, and the show itself for Best Revival of a Musical.)  P.S. Classics puts out its usual first-rate package, with color photos, introduction by Peter Filichia, synopsis, and libretto.--David Horiuchi