The First Rock-and-Roll Dracula Movie!
Due to be crowned King of the Netherworld by his mentor Merlin the Magician (Ringo Starr) at a monster's convention Count Downe (Harry Nilsson), the son of Count Dracula, falls in love with the beautiful but human Amber and finds himself in conflict with Baron Frankenstein who is vying for the same honorary title.
And among the musicians:
Did you know?
Keith Moon died in the flat he rented from Harry Nilsson in London - the same flat in which Mama Cass died.
One DVD, from VHS.
NB: low quality but watchable