White Rabbit by Jefferson Airplane. I first heard it at a fancy dress party where the theme was 'Hippies'. It's short, powerful and sums up the sixties perfectly- according to my parents anyway. I didn't arrive until 1970. Late as always!! Grace Slick's voice is almost enchanting.
London's Calling by the clash..Pumping guitars angry vocals and lyrics, its like a call to arms to the young to get off their complacent arses.. it still sounds powerful today 26 years on... the word classic does not do it justice.