"A Cinderella Story: Once Upon a Song" is a 2011 musical film that serves as a modern retelling of the classic Cinderella fairy tale. The story follows a young girl named Katie, who dreams of becoming a singer while living with her cruel stepmother and stepsister. As Katie navigates her challenges, she meets a charming boy named Luke who helps her pursue her passion for music. The film features original songs and highlights themes of self-discovery, friendship, and the importance of following one's dreams.