The History of Rock Music: 1951-1989 - Piero Scaruffi

Given the size (800 pages total), it is now split in two volumes, about 400 pages each. If you own the old edition, the first volume contains the first four parts (1950s to 1980s), updated and corrected (about 300 small corrections and about 40 small additions). The second volume covers the 1990s (some massively revised text of the old edition and a lot of new text) and the 2000s (all new text). The number of names in the alphabetical index increased from 3,100 to 4,800. This is a good way to gauge how much material has been added to the second edition.