Horror/Slasher flick from 80's
Trying to find the name of a horror/slasher flick from the mid to late 80's. Here's the premise. A rock n' roll guy goes around killing people with his guitar. The guitar is red & white and has a drill attached to it. Every time he is ready to kill someone he plays the guitar before killing them. His main obsession in the movie is a teenage girl who he can't have, so he kills off all her friends. Finally he decides to kill her, and the line he says before he tries to kill her goes... "she broke my heart she made me cry, so don't you know she had to die." I'm desperate for any suggestions. Thanks.