Don Bluth's lavish animated musical Rock-A-Doodle was not a success when it was released in 1992. It's not hard to understand why: the film varies wildly in tone and the story makes little sense. In the live-action prologue, a little boy named Edmond learns that the crowing of Chanticleer the rooster did not make the sun rise, as everyone thought. But when a flood threatens his family's farm, E…