ONE MILE, NO SMILE! Robert Moses, The Musical? Yes, and biographer Robert Caro dropped by a rehearsal (while "deep into the fourth and final installment of his Lyndon B. Johnson opus") to comment.
added: There's also a new one-man play on Abbie Hoffman, but that should be a musical as well. "Yippie for Yippies," "Steal This Song," "My New Hope," etc. Because the last attempt to dramatize his life did not so much work for me.