“Harmony,” Barry Manilow’s musical about a German singing group with Jewish membership crushed by the Nazis, is due to reach Broadway this fall after more than two decades of development, producers said Friday. The musical, which enjoyed a sold-out run at New York’s National Yiddish Theatre Folksbiene last spring, will begin previews at Broadway’s Ethel Barrymore Theatre on Oct. 18, the production said. Opening night is scheduled for Nov. 13. Advertisement The show tells a story of The Comedian Harmonists. Comprised of six real-life German men, three of them Jewish, the popular group was deemed “degenerate” by the noxious Nazi...