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Nightmare Fuel: Can
That faceless gigantic Galactus on the cover of their debut album "Monster Movie".
Most of the material on their Magnum Opus"Tago Mago" (1971) qualifies this trope.
"Mushroom": a claustrophobic track where Damo Suzuki dabbles about a "mushroom head" and "he was born and he was there." It's heavily implied he's singing about a mushroom cloud of an atomic bomb explosion and all the terror he witnessed then. The song concludes with the sound of a atomic bomb explosion, literally blasting everyone and everything out of existence.
The immediate next track, "Oh Yeah" is sung completely backwards and sounds as if nuclear dawn has set in.
"Halleluhwah": a dark, hypnotic percussive track. Though, for some people, it is also a very sexy tune.
"Aumgn", a haunting track driven by Suzuki's weird vocal sounds.
"Peking O": at a certain point the music sounds neurotic and Suzuki starts yelling freakish sounding gibberish, much like someone Go Mad from the Revelation.