It is true that without Tory the the song would be nothing and she deserves some credit, but she still is following on from what Rick/Roger had already laid down. If she hadn't have sung that they would have put something else on top so it wouldn't just be keyboard progression. This may have been worse maybe better (doubtful) but at the time she was happy to go with her session fee to turn around 30 years later is just greedy.

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The Pink Zeppelin Carries Aloft The Court Of The Crimson King Over Deep Purple In Rock