An American Film: "Nocturna" (1979)
aka "Grand-daugther of Dracula" or "Diskothek Dracula"
Directed by Harry Hurwitz
With The Moment of Truth in the cast
Disco queens Gloria Gaynor and Vicki Sue Robinson sing "Love is Just a Heart Beat" and "Nightime Fantasy"


See the cool piclture:


Nocturna