Dude, I so totally agree with you here that it's scary! An interesting (IMHO) thing that came up in a similar discussion on another forum was that most ardent prog fans are NOT really big on basic early rock 'n roll. Or, in my experience of having lived through this in real time in The Paris of the Prairies, is that most of 'em aren't really big blues fans either. Given that the Hall o' Fame at least claims to value those two things highly, their choices aren't that surprising. On the other hand, if we just take the practical approach of do they have 'a sound of their own' that some significant portion of the fandom can recognize, them most name prog bands qualify as do the Zombies who had latent prog tendencies...feeling reconciliatory today, I am. 'Trane as an influence makes as much sense as Miles. And Little Walter should be in as a leader as well as a sideman.