I'd probably have to go with Kashmir too. Happy to say I saw that performance of it at Knebworth.
Other particular favourites would include:
The Who: Won't Get Fooled Again
The Rolling Stones: Gimme Shelter
Deep Purple: Smoke on the Water
Kiss: Rock n Roll All Nite
Van Halen: Dance The Night Away
Thin Lizzy: The Boys Are Back in Town
AC/DC: You Shook Me All Night Long
Don Henley: Boys of the Summer
Blue Oyster Cult: Don't Fear The Reaper
Lynyrd Skynyrd: Sweet Home Alabama
Boston: More Than A Feeling
Rush: Spirit of Radio
Joe Walsh: Life's Been Good