Deep Purple - Machine Head tour, 1972.
I still remember the experience. I was only eleven years old and I wasn't really sure what to expect. Good Gawd! That one event was seminal in leading me down the slippery slope of life (Drugs, Sex & Rock -n- Roll).
Thank god I've recovered. One of the guys that attended that show with me is no longer here. He never changed his life-style. I think of him with a smile every time I hear Highway Star (he was a true highway star, but he never slowed down).
Good thread.