The songs are strong, but the story needs work in this new musical about depression. In David Gosz and Leo Fotos's clinically subtitled new show, Tru: A Musical for Mental Health, an English teacher (Stephen "Blu" Allen) grapples with his codependent relationship to his undiagnosed mental disorder in the most literal, theatrical terms. "Her" (Meredith Kochan), the teacher's ghostly, emoti…
