Led Zeppelin, "Battle of Evermore"
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Flight of the Conchords, "Frodo"
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Horward Shore, "Concerning Hobbits"
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Eric Clapton's "Layla" played by a Dwarf
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And because I can't think of anything else without pulling from the movie again...
Rhett & Link, "Fast Food Folk Song"
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"But...gorillas don't have claws." - Azazel22
"Broccoli gorillas do." - McMoogle