"Heart of Darkness" is also the name of a Pere Ubu song, first released on the Datapanik in the Year Zero EP, in or around 1978. It's a good song, indicative of their early style. If I could find a listing of them, or understand anything other than the chorus on the record, I would list the lyrics to it here.

The chorus of Heart of Darkness, by Pere Ubu:

"I'm looking into the
Heart of Darkness."