[TOMT][MOVIE][1970s-80s] A horror film similar to Texas Chainsaw Massacre

It was a film I've watched many years ago on VHS. The story is similar to Texas Chainsaw Massacre; as it follows a deranged redneck family that preys on a bunch of teenagers in a small town. There's also a sheriff character who I remember to be a creep.

The most striking thing I can remember about it is the credits song, a ballad with the lyrics "You're on your own, you're all alone, you can go home anymore" sung by a woman.