Personally, and I know that I may contradict popular opinion, I feel progressive rock should be largely composed and played by a rock band or at least contain some rock instrumentation. I would be hesitant to call a band who only improvised on wind instruments rock anything. I do realize there are times when such bands can play in a way which still makes them sort of rock-y (Apocalyptica comes to mind), but when they don't, I am particularly hesitant to call it prog rock. On that note, I personally am a bit hesitant to call Robert Wyatt's Rock Bottom (mentioned in my previous post) prog rock. It's certainly avantgarde and progressive in a sense, but where's the rock?
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