Greased Lightning
Starring Richard Pryor, Beau Bridges, Pam Grier, Cleavon Little, Vincent Gardenia, Bill Cobbs, Noble Willingham, Richie Havens, Earl Hindman, Julian Bond
It's a documentary and drama movie, and has a rating of 6.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Spain.