This is a Disney Channel original movie starring Bridgit Mendler, the leading actress of the Disney Channel TV series "Good Luck Charlie", adapted from the teen novel of the same name. Five originally inconspicuous high school students met during a detention after class. A lemonade vending machine outside the detention classroom brought them together, and the music they played accidentally sparked a spark. Unfortunately, the school is run by a mean principal who values interests. For the sake of interests, the principal prefers athletes, and other activities not related to sports are forced to go underground. The five students then formed a band, Lemon Big Mouth, which took on the role of a leader in this school to speak for ordinary students and call on everyone to express themselves bravely; at the same time, setbacks and criticisms followed one after another, and even the lemonade vending machine could not escape the fate of being removed by the principal's order. Can these lemonade lovers win the freedom to express themselves for everyone? Can their music career achieve the final glory?