Forbidden Broadway: The Next Generation is review-proof. Creator/Writer/Director Gerard Alessandrini started parodying The Great White Way in 1982, and The Triad Theatre (158 West 72nd Street) was packed with show-tune types for its first reincarnation in five years. Running through November 30, the 80-minute revue is the best kind of tried-and-true evening, matinee or celebratory time...
