Spectacular! tells the story of a high school student named Nikki (Aly Michalka) who dreams of becoming a singer-songwriter. She meets a fellow student, Dylan (Nolan Funk), who is also a musician. The two form a bond over their shared love of music, and they help each other to achieve their dreams.
High School Musical, on the other hand, tells the story of two high school students, Troy (Zac Efron) and Gabriella (Vanessa Hudgens), who meet at a New Year's Eve party. They discover that they both have a passion for singing, and they decide to audition for the school musical. The two face challenges along the way, but they ultimately find success and love.
While both films are musicals set in high school, they have different stories, characters, and music. Spectacular! is a more realistic film about the struggles of pursuing a career in the music industry, while High School Musical is a more lighthearted film about finding love and friendship.