A lot has changed since High School Musical debuted on Disney Channel Jan. 20, 2006. Head back to East High to find out what Zac Efron, Vanessa Hudgens, Ashley Tisdale and more stars are up to now.

Before graduating from a California high school, students must complete a minimum of 13 state-mandated courses, including three years of English, two years of math and two years of science.

Director Halina Reijn breaks down the music and inspiration (including her own on-screen nudity) of Harris Dickinson’s sensual shirtless hotel dance.