The best song off of Permanent Waves? I don't know, but it's up there! This song goes from a calm acoustic beginning to blisteringly fast arpeggios, drum patterns, and Geddy's signature high range singing. The song then calms down near the end with a nice 12/8 shuffle pattern that kind of combines the beginning calmness and the middle madness to help ease the listener at the tale end of this track.
As I'm typing this it's hard to think of another song Rush released since then, that has the same amount of energy over such a long period of time (maybe Headlong Flight). It's a classic Rush song, and beyond that, just a classic song.
-Tempo map updates
-Minor G,B,D changes