If you want an eerie song, Tool is a great band for that. And especially if you watch their videos as well
They're just very dark, sometimes bordering eerieness. The long intro of their song Flood for example is a perfect example.
But what is creepy music? It depends on your definition I guess. I have heard many songs that don't sound creepy until you see the video or until you figure out the meaning of the lyrics. I guess creepy in itself is a vague term depending on one's interpretation.
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Do what Thou wilt shal be the whole of the Law.
Love is the Law, Love under Will. And...
every man and every woman is a star
(excerpt from The Book of the Law - Aleister Crowley)
"Od lo avda tikvateinu" (excerpt from the Israeli hymn)