A bit of a cop-out, but I don't think you can go wrong with any of the first four albums. Liege & Lief is the pinnacle of the style for me, so that would probably be the best starting place. The earlier albums have a bit more of a psych edge in places, especially the first, which has a breezy San Francisco vibe. Full House is still quite good, but without Sandy, it's not entirely the same for me. I don't bother with anything after that - there are just too many other things to listen to.
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