There was a time when progressive rock sort of emerged from psychedelic rock. In the early days, the two shared a lot of territory. Then, when you consider the whole folk prog movement, the whole equation was even more convoluted - and interesting. This album is a reissue from 1970 and lands right in that neighborhood. It's an effective set, although it does feel a bit dated. I have to admit that I'm not a big fan of shaking vocals (when I was a kid I called T-Rex (in the days when they were still "Tyrannosaurus Rex") "goat music" because of that issue), so that takes some points from this for me. Still, it works well despite the shortcomings.
This review is available in book format (hardcover and paperback) in Music Street Journal: 2017 Volume 2 at lulu.com/strangesound.