El hombre y el monstruo
The Man and the Monster is a 1958 Mexican horror film, directed by Rafael Baledón.
Plot summary
The film is about a pianist who sells his soul to the Devil in order to become the greatest pianist over the world. But, every time a particular piece of music is played by him -Piano Concerto No. 1 (Tchaikovsky)-, he transforms into a murderous monster.Reception
According to the website Classic-Horror:"Intelligently dubbed, marvelously acted, and nicely directed, there's not a lot The Man and the Monster isn't, except, perhaps, expensive."