The genres weren't a topic so much as today, and so many reviews from that time even not mentioned a genre. The evidences are in the mailing lists made by LPs re-sellers, but the prog gods are saying that those ancient mailing list "are not valid".
However, I provided there an evidence that Steve Miller Band's 60s stuff was regarded as "milestones of progressive rock" (the source is The illustrated New Musical Express Encyclopedia of Rock from 1976) in favour that Steve Miller Band to be added to progarchives' "proto-prog" section but it also was ignored and ridiculed by the grumpy one who is, btw, a kind of "mastermind" of the prog gods.
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