Knebworth, in England, in 1985 included UFO, Meatloaf, Scorpions with headliner, Deep Purple. All hard rock bands, with exception of Meatloaf. Deep Purple had 2 sets of tower speakers (array) off stage - in the crowd- and during certain songs moved the music to and fro in a quadrophonic type of setup. Never heard or saw such an arrangement before or since. Perfect Strangers.
