Name That Movie! (please help!)

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I've been trying to figure out the title of a somewhat nightmare-inducing movie I remember from my childhood - ANY help would be greatly appreciated.

Details I remember:
  • Probably made for TV
  • Probably 1980s
  • Mother and daughter live in a house or complex that has a garbage furnace in the boiler room / basement
  • Daughter is always practicing a somewhat eerie song on the piano
  • Daughter is a serial killer who (I think) disposes of the bodies via the furnace

Thanks in advance!