yeah there are soooo many bands inspired by the lord of the rings. tons.
there's Blind Guardian too, their lyrics are practically only about the Tolkien world in general.
I found out what Amon Amarth ment by accident... I was making a new character for a video game, Guild Wars, and was looking up Lord of the Rings words... and when I looked up mountain names in lord of the Rings, the first one that popped up was Amon Amarth, it was another name for Mount Doom i think pretty cool.
ps-if anyone plays Guild wars, my warrior's name is Mistress of Metal, Amon Amarth was already taken, haha.