This is a bit all over the place, but in a good way. It starts with an epic song, somewhere between hard and prog rock. It has some simple/nice folk songs (with Anderson's voice weirdly making me think of Ben Harper). There's the flute, everywhere. Flutes are underrated. This weird assembly of genres is still working, decades later, and their music is still pretty exciting.
1971 was an odd year for music, and this unusual mix of folk and prog is a prime example. We have weird vocals, elaborate guitar noodling, flutes, fingers in ears and plenty of standing on one leg. It’s definitely not a concept album though, at least according to Ian Anderson. There is a theme of organised religion in opposition to a more hippy, dippy god though, which crops up in several places. This probably seemed very deep and meaningful at the time but I suspect that a lot of the lyrics were chemically assisted.