The fast, live version of We Will Rock You (on the B side of Crazy Little Thing Called Love).

Ace of Spades - although this works as a folk song if sung to a jig tune similar to The Lincolnshire Poacher.

Gimme Three Steps (Lynyrd Skynyrd)

And of course, Freebird, although as I get older, I lack the stamina for the full length version.