If you think about it....and you might not want to....you can divide the Eagles' output into two periods. The first, beginning with the release of "Take it Easy" --fifty years ago this past week--constituted their slick country-rock, adult contemporary easy listening period. That which was encapsulated in that first Greatest Hits album. This period coincides with Bernie Leadon's tenure with the band. He had previously been in the Flying Burrito Brothers (for their second and third albums) and, before that, had played with Gene Clark in Dillard and Clark. His B-bender telecaster and banjo were, as much as anything, responsible for much of the Eagles' country sound. At the end of the One of These Nights tour, Bernie poured a beer over Glenn Frey's head and - in what would become an end of tour ritual - quit the band*. Enter Joe Walsh and so begins the second, laid back stadium rocker, period. The riffs and guitars got heavier. Joe playing featured more heavy s...