Is grease the movie a musical?

Yes, Grease is a musical. It is a 1978 American musical romantic comedy-drama film based on the 1971 musical of the same name by Jim Jacobs and Warren Casey. It stars John Travolta and Olivia Newton-John as Danny Zuko and Sandy Olsson, two teenagers who fall in love during the summer of 1958. The film is set in the fictional Rydell High School in the United States.