Arcadia, Wisconsin seemed to be an ordinary town for Simon X, who wanted to be the best trumpeter ever. After he and his classmates: Lulu DeBarge, the harpist, Krupa Patel, the violinist, and Max Winehouse, the saxophonist, audition for the prestigious Bartholomew Performing Arts Academy, a random twist of fate leads them on an incredible adventure aboard the Night Train.
By morning, the children are magically transported to a parallel reality arriving at their ultimate destination. A wild fall brings them to a time-warped Trolley Car Diner with an Everlasting Jukebox. There the children meet Madame Charisma Divine, a sophisticated yet eccentric lady, who guides them along their journey. Many wonders and magical allies await, including the King of Pop, a kindhearted inventor, who welcomes them to his whimsical soda pop factory, bedazzling his guests with amusement attractions, carbonated concoctions, androids and more.
Beleaguered by the Shadows, the nefarious authority figures, the children soon discover many haunting secrets about Boogieland. Yet each encounter leads them closer to their destined meeting with His Purple Majesty, a master musician, who teaches the children an invaluable music lesson, which prepares them for their grand recital. Can Simon, Lulu, Krupa and Max overcome the Shadows and their greatest fears to unleash the genius melody within?