[GordonHLau]

Since you are into Zep (me too!):
-Dancing Days
-In My Time of Dying (actually in open A, 1 step up from open G, I use capo at the 2nd fret)
both tunes use a slide

Rolling Stones:
-Honky Tonk Woman
-Brown Sugar

George Thorogood:
-Bad to the Bone

GL