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I only learned about Zevon's letterman appearance a few weeks ago and watched that. Quite ... powerful, in a very low key way. Was never a huge WZ fan, but had friends who were always in to him - his work is making its way in to my rotation now. Brainwashed very much seemed like a 'best of' from George. Creative, spiritual, humorous, polished (but still a bit of a 'raw' feeling, in some ways). All his skills and tale…
If you're looking for some interesting Zevon listens, there's a few YouTube videos from the early 80's that are quite good. He also has shows on archive.org which can be listened to.
Thanks!