Simplify the following text for a Grade 7 native English-speaking person.
Original: 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 .
Simplified: All the voices except those of Madeleine and Gabriel were done by Oliver Postgate who also wrote the stories .