: Accompanied by puppies Sparkles and Lily, and twin musicians Ian and Jeremy, Liana and Alexa travel to the Diamond Castle. They eventually defeat Lydia by playing the Muses' instruments and restoring harmony. Key Themes & Symbolism
: They discover an enchanted mirror containing Melody, an apprentice muse fleeing from the villainous Lydia. Lydia, an evil muse who turned the other muses to stone, seeks the key to the Diamond Castle to control all music. Barbie And The Diamond Castle
: The central moral is that "friendship is the true treasure". The girls wear heart-shaped necklaces made from stones that protect them from Lydia's hypnotizing music. : Accompanied by puppies Sparkles and Lily, and