Larks Tongues in Aspic for me, too. I was into all prog stuff that came before in which songs had a beginning, a middle, and an end, but with Larks Tongues, my ears were opened to the middle. As the ads for the album said at the time, "Play twice before listening," I had to in order to get fully what I was hearing. I'm a slow learner, but once I get it, it's got.
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