Voyage of the Rock Aliens(1985)
Goofy musical comedy featuring a group of aliens (Rhema) who come to earth in search of rock music. They find it in the strange town of Speelburgh, along with a beautiful wannabe singer (Pia Zadora), her greaser boyfriend (Craig Sheffer) and his pack of cronies (Jimmy and the Mustangs), two escaped homicidal lunatics (Michael Berryman & Wallace Merck), a mutant sea monster... and (briefly) Jermaine Jackson.
Made by Curb Records as a showcase for their artists, this ultra-'80s film played in limited release worldwide, but it has since gone on to garner a cult following.
This trailer was originally posted to YouTube by movietrailers03.