Rockula is a 1990 American comedy film directed by Luca Bercovici. The story centers on a vampire under a curse (the tagline is: "He's a vampire that hasn't scored in 400 years?tonight's the night!"). It was written by Bercovici and Jefery Levy. Dean Cameron stars as the vampire Ralph LaVie, Toni Basil plays Phoebe LaVie, Ralph's mother, and Thomas Dolby is the villain Stanley.
Bo Diddley has somewhat more than a cameo as Axman, playing in Ralph's band, incidentally named Rockula. The director of photography was John Schwartzman, later the DP on Seabiscuit and Saving Mr. Banks.
(Summary from Wikipedia)