Spanish with English Subtitles
El mundo de los vampiros (The World of the Vampires) is a 1961 Mexican horror film, directed by Alfonso Corona Blake. The film is about a vampire, Count Sergio Subotai, who seeks revenge against the descendant of an enemy family. The hero is a musician (played by Mauricio Garcés) who knows how to play a piece of music that can kill vampires.
https://en.wikipedia.org/wiki/El_mundo_de_los_vampiros
Wrong post link.
Thanks. I think I fixed it.