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In this direct-to-DVD movie of 2008, Barbie and Teresa tell Stacie the story of two best friends, Liana and Alexa. Although the two girls do not have much, they have each other and a love of music. It gets worse when a nasty storm destroys all the flowers they would usually sell, but an act of kindness grants them a magic mirror.Inside the mirror dwells apprentice muse Melody, who used the mirror as a means of escaping evil muse Lydia, who intends to grab the key to the muses' Diamond Castle and plunge the world into a state of grim darkness.Now, Liana and Alexa must journey to the Diamond Castle themselves and stop Lydia from controlling all the world's music and dooming it to darkness forever.
Evil Always Triumphs In The Middle: Despite the attempts of the heroines to keep Melody out of Lydia's clutches, the evil muse gets her hands on the girl-in-the-mirror and nearly gets her to give up the location of the Diamond Castle before Liana and Alexa arrive to save the day.
Evil Costume Switch: Averted, as Lydia is already wearing a pretty evil-looking outfit in a flashback.
Just Between You and Me: Lydia, after capturing Alexa, takes the time to explain exactly how she tricked her because she knows that Alexa took off the necklace that warded off her mind-control spell.
Karmic Death: Lydia turned the other muses to stone, and she and Slyder are turned into stone at the end.
Kneel Before Zod: Lydia sings that all will bow to her once she rules the Diamond Castle.
Large Ham: Lydia can't go one sentence without sounding overconfident and sure of her victory.
Least Rhymable Word: Lounge Lizard twins Jeremy and Ian are alternating lyrics in a song to charm the heroines. At one point Jeremy ends a line with the word "orange," and Ian quips, "You know perfectly well nothing rhymes with orange."
Limited Wardrobe: Alexa and Liana only wear two dresses, which is unusual for a Barbie film.
Loveable Rogue: Ian and Jeremy fail to impress the heroines at first, and show up late to their own gig.
Lounge Lizard: Jeremy and Ian, who try to serenade Alexa and Liana with a song.
MacGuffin Location: The titular castle, which creates every kind of music. Finding it is Lydia's goal.
Magic Mirror: Melody hid inside an ordinary mirror, which turned it into a magic one.
Magic Music: Music is a source of great magic in this world.
Smug Snake: Lydia is often very overconfident and assured of impending victory, which makes her reactions whens something goes wrong quite funny.
Sorry I'm Late: Ian's quip when the twins rescue the girls from Slyder.
Source Music: Despite being billed as a "musical fairy tale," only one of the songs can be considered non-diegetic: the villain's song, "Wonderful Me." And even that may be diegetic, as her minion applauds at the end.
Suspiciously Apropos Music: Alexa and Liana ask Melody to teach them her favorite song, which turns out to be the key to the Diamond Castle.
They also sing for their supper in an inn, with lyrics that match their current situation ("We're Gonna Find It"). At that same inn, Jeremy and Ian improvise a song to hit on the girls.
Sycophantic Servant: Slyder is completely devoted to Lydia and often tells her how wonderful she is.