the doors - the end or five to one or unknown soldier
black sabbath - war pigs - children of the grave
deep purple - child in time
baby, please don't go ... can't think of who did the original ... many covers from ted nugent, ac/dc and so on
woodstock concert
groups: ten years after, led zeppelin, the who, arlo guthrie, bob dylan, janis joplin, mamas and the papas, iron butterfly, the yardbirds .... and so on
depends if you're looking for folk end, drug culture, or heavier.