Asagrimmr

Older than that would be "The Thing That Should Not Be" by Metallica from Master of Puppets album...

"Not dead which eternal lie, stranger eons death may die"

Which of course is Lovecraft's "Call of Cthulu"

"That is not dead which can eternal lie

And with strange aeons, even death may die"

I forgot about the Drowned God / Cthulu connection.

I can't remember the specific page, but Mad King Aerys is described as having fingernails that were nine inches long, an obvious reference to the band Nine Inch Nails. Also the Ironborn's saying "What is dead will never die. . . " always reminded me of a line from a Children of Bobom song "Like living dead we'll never die. . .".