Anthrax (IMO) did an excellent job covering one of my favorite Rush songs
"Anthem":
http://www.youtube.com/watch?v=Pq-OPoNXf-Y
They also did alot of other great classic songs from the past- I just heard their cover of Thin Lizzy "Jailbreak" and that was excellent as well. Now, I'm going to check out the cover they did of AC/DC "T-N-T".
Sincerely, Clayton