The latest episode of Queen's official YouTube series Queen The Greatest Live! (Queen Live In The 21st Century - Episode 45) features Brian May and Roger Taylor explaining how the Queen live show has changed and evolved in the 21st Century. In one of the featured clips, Brian May is talking about what he thinks makes up a good concert light show, and he brings up Rush's light show as a prime example (thanks Andrew S):
... I remember going to a Rush show years and years ago. And the guy [Rush lighting director Howard Ungerleider] played his lighting desk like it was a piano. Everything that you saw when you looked up at the stage came out "bang bang bang!" in time with every single note (and there are a lot of notes in a Rush show [laughs]!), and the lights were completely tied into that - it was amazing. It was magical - I never forgot that. ...