Classic Rock song.

Well here's the first problem. I have no idea what the lyrics are. I always catch this song during it's rift. It's a Classic Rock song. There is a explosion then it goes into a rift in the lower frets (High toned) the tune is something like Dun nun Nuuun Dun Nun Nun Nun I think it's by Queen or Led Zeppelin. ANy info on the song would be greatly appreciated

"wherever I may roam" by Metallica has the above mentioned explosion and rift.