Melody's song is the key. They sing together and the Diamond Castle reappears. Stepping inside, Liana and Alexa are magically given new dresses and Melody is freed from the mirror. The girls enter the music room, but Lydia returns with Slyder. The three of them play the Muses' instruments and sing together, overpowering Lydia and turning her and Slyder to stone. The other Muses are freed and Lydia's spells are finally undone. Liana and Alexa are then crowned princesses of music and Melody finally becomes a Muse. Melody invites them to live in the castle, but they choose instead to return to their old life with their new pets, with the Muses giving the two magic seeds which can blossom instantly into golden flowers. As the story ends, Stacie realizes nothing can break true friendship and goes to apologize to Courtney; Barbie and Teresa resume playing music together, happily. Characters Kelly Sheridan as Barbie/Princess Liana – Barbie stars as Princess Liana, a peasant girl/princess of music who shares a cottage in the forest with her best friend Alexa. Liana is loyal and brave. She's not afraid of tricky situations (except for thunder and lightning) and she loves to sing. Cassidy Ladden as Teresa/Princess Alexa – Teresa also stars as Princess Alexa, a gardener/princess of music who lives in a cottage with Liana. They are best friends, though Alexa often wishes that they could live in grand style, so they won't have to worry about anything. She believes in magic, and she has a silly sense of humor. She has a beautiful singing voice. Maryke Hendrikse as Melody – Melody used to be an apprentice to the two Muses of Music who live in the Diamond Castle. She was trapped inside the magic mirror while trying to hide from Lydia. She loves to sing in harmony with Princesses Liana and Alexa. Jeremy From as Jeremy and Noel Johansen as Ian – Jeremy and Ian are twin musicians who sing and play guitar. They befriend Liana and Alexa and help them battle with Lydia on their way to the Diamond Castle. Kathleen Barr as Lydia – Lydia is an evil former Muse and current sorceress who wants Diamond Castle for herself, with the intention of making it gloomy. She plays her flute to use her evil spells. She is the main antagonist. Mark Acheson as Slyder – Slyder is a clumsy, flying