With their first six studio albums not containing a single dud track, trying to neatly assemble a Led Zeppelin 'best of' must have been quite a daunting task. All in all, the folks at Atlantic did an admirable job when the first-ever, single-disc Zeppelin 'best of's' were issued in 1999 (Early Days) and 2000 (Latter Days), covering most of the essentials. For fans that wanted to buy both discs in one shot, both were packaged together in 2002, under the title of Early Days and Latter Days…