"Rock 'n' Roll". They opened with it on both occasions that I saw them play. As high energy an opener as I can ever recall at a concert
"Gallows Pole". Page makes a blues classic his own in a simple and elegant way.
"Babe I'm Gonna Leave You" . Memories of my first girlfriend.
"Whole Lotta Love" . Nothing is simpler, not much is better.
Lotsa possibilities for #5, maybe "Ramble On" or Black Mountain" or.....
Marty