Input (grade 12): Sandra Kerr and John Faulkner provided the voices of Madeleine and Gabriel respectively, and put together and performed all the proper songs. All the other voices (including the narrator and one out-of-tune mouse) were provided by Oliver Postgate, who also wrote the stories.
Output (grade 7): All the voices except those of Madeleine and Gabriel were done by Oliver Postgate who also wrote the stories.