Liana and Alexa (Barbie and Teresa) are best friends who share everything, including their love of singing. While walking through the forest, the girls find a magical mirror. As they clean the mirror and sing, a musical muse named Melody appears in the mirror's surface. Melody tells the girls about the secret of the Diamond Castle, which is the home of all music, and where three musical muses once resided until one evil muse, Lydia, tried to take the castle for herself.
In an act of safekeeping the other two muses entrusted the key of the Diamond Castle to Melody. And to keep the key safe from Lydia, Melody hid herself in the mirror, but now she can't get out. She needs Liana's and Alexa's help to free her from the mirror and to save the Diamond Castle. Along their way, Liana and Alexa make new friends and enemies.
Produced by Nancy Bennett
Starring Kelly Sheridan