Perhaps it's a matter of taste then that prog to me is much closer to jazz than to classical. I love the music that came from the Canterbury scene and Great Deceiver-era King Crimson (who incorporated both improvisional elements and classical styles while avoiding symphonic song-structures).
Still there is one thing that – to me at least – is inherent in all prog, and that is complexity. That's characteristic both of the classical and the jazz/improvisional.
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Håkan
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