Bikinis y Rock

The musical comedy Bikinis y rock (1972) (a remake of 1962's A ritmo de twist) stars Verónica Castro, Olga Breeskin and "Loco" Valdés (the star of A ritmo de twist) ; the director, Alfredo Salazar, had a long career as a writer for Mexican films like Santo en El tesoro de Drácula, Frankestein el vampiro y compañía, Las luchadoras vs el robot asesino and La momia azteca (as well as A ritmo de twist.
Mexican bands Bandido, El Ritual and Peace and Love fill out this comedy with covers (in english) of rock classics like "Vehicle," "American Woman" and "Roll Over Beethoven."
A lack of knowledge of Spanish is no barrier to enjoying this film. If you've seen When the Boys Meet the Girls, It's Trad, Dad!, For Those Who Think Young or any beach party movie the plot is easily understood.