Led Zeppelin require no introduction - their fusion of blues, rock, proto-metal and vivid lyrical imagery ushered in the 1970s rock boom, invented stadium rock and have influenced every would-be rocker around the world. Many books have been written on the group, each of whom are legends in their own right, but Celebration Day is the first book to explore the group's world and career in this fashion - an extensive A to Z reference work dealing with every song on each of their albums, every major gig they ever did and the background of each of the four musicians.