From the 1979 album “Join Hands,” this simultaneously frightening and delirious song about …. about … to be honest, I have absolutely no damn clue. All I know is that it involves a playground, screaming children, and a sense of dread that comes from someplace I’m not sure I want to know about. Those slashing guitars and swirling sounds are mesmerizing. Somewhere, Marilyn Manson is watching and taking notes.