Valhalla

I learned a new word today. I've heard it in two places: Howard Zinn's A People's History of the United States, and in a Led Zeppelin song, "The Immigrant Song." The word is "valhalla".

When I used to hear this in the Led Zeppelin song, I just thought it was some weird obscure word I would never find, so I just didn't try. Then I read it in Zinn's book, (actually I heard it read by Matt Damon on CD), and I had to look it up. If you click on the Zeppelin link, the Immigrant Song plays automatically, by luck on my part.

The Oxford Desk Dictionary & Thesaurus
Valhalla (n.) (in Norse mythology) palace in which the souls of slain heroes feasted for eternity

Then I lifted this "definition" from:
"Valhalla." Encyclopedia Mythica from Encyclopedia Mythica online. http://www.pantheon.org/articles/v/valhalla.html. December 23, 2004].
I think this gives a more detailed definition of the word.

"Valhalla, Hall of the Slain, in Norse mythology is the hall presided over by Odin. This vast hall has five hundred and forty doors. The rafters are spears, the hall is roofed with shields and breast-plates litter the benches. A wolf guards the western door and an eagle hovers over it. It is here that the Valkyries, Odin's messengers and spirits of war, bring half of the heroes that died on the battle fields (the rest go to Freya's hall Folkvang). These heroes, the Einherjar, are prepared in Valhalla for the oncoming battle of Ragnarok. When the battle commences, eight hundred warriors will march shoulder to shoulder out of each door. "


So there's Valhalla for ya. It's funny that Led Zeppelin has that word in that song, I really don't know what "The Immigrant Song" is all about. I also know that in "The Battle of Evermore" by Led Zeppelin, an awesome song, by the way, Robert Plant says, "the ringwraiths ride in black... ride on..."
The only other place I have read about ringwraiths is in the Lord of the Rings. I know what ringwraiths are, I just wonder if Plant (or the songwriter, whoever that was) was a Tolkien fan.

Did I do any good for myself by ironing out this wrinkle in my brain?