Trick or Treat (1986) - DVD - used

Not to be confused with the 2007 film starring horror icon Sam. This Trick or Treat, released back in 1986, was a campy attempt to mix a slasher movie with rock n' roll. 

Per IMDB: "A bullied teenage boy is devastated after the death of his heavy metal idol, Sammi Curr. But as Halloween night approaches, he discovers that he may be the only one who can stop Sammi from making a Satanic comeback from beyond the grave."