IIRC, it was hearing Powerslave that convinced Bruce – while supporting Maiden – to jump into the band once the chance was there.
Erm, no it wasn’t: Bruce recorded Powerslave with Maiden, and also Piece of Mind before that and Number of the Beast before that.
All great suggestions. May I throw a modern contender into the pot?
[video]http://www.youtube.com/watch?v=hSmsPydD7a8[/video]
A classic:
[video]http://www.youtube.com/watch?v=cOVzXYEU3Bk[/video]
I also agree with Phantom of the Opera, sung by Bruce, of course.