Wikipedia
Rockula
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. Starring as the vampire Ralph LaVie, is Dean Cameron a prolific 1980's comedic actor. 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, who was later the DP on Seabiscuit and Saving Mr. Banks.