Acoustic Progressive Rock

Buckethead has some great acoustic/progressive
stuff. Try "Electric Tears" or Population
Overdrive". Do a search at Amazon & read some
reviews. It's instrumental.

Return to Forever had a few acoustic cuts. No Mystery had a few and the earlier ones were mostly acoustic, although Chick would break out the distorted Rhodes on them too.

Most of the acoustic "prog" that I know of is more jazz than rock though.

Early Zawinul was acoustic, but not terribly fusiony at that point yet.

You could try the Hancock/Corea dueling piano recordings "An Evening with Herbie Hancock & Chic Corea"

How about some Freddie Hubbard - "Red Clay"

Enjoy,
Bob

From what I have read and heard, there is very little acoustic stuff. Lots of it is more jazz than anything else. I have not heard the Strawbs, but I will give it a check. I would love something by King Crimson, Dream Theater, maybe acoustic Pink Floyd/Roger Waters, etc. I wonder why this hasn't been tapped.

Tough genre. Reaching back, I recall Gryphon "Midnight Mushrumps" as acoustic/progressive in a medieval sort of way. The music was good, but it was sometimes hard to get past the lyrics. One of the virtues of prog rock is often their nonsensical lyrics, which tend not to become dated quite as quickly. Another suggestion is Anthony Phillips 'The Geese and the Ghost". A nice, acoustic/prog album (some vocals, not much).

The very first Genesis album, "From Genesis to Revelations".
Also from the same band, another nod to Anthony Phillips including "Sides","Wise after the Event" and,of course,"The Geese and the Ghost".

You might like Steve Hackett's solo stuff, such as "Bay of Kings" or Mike Oldfield's "Incantations". Oldfield's sister, Sally, made some beautiful records also.

Granted, there are electric devices and treatments used occasionally (these pioneers could'nt help themselves), but for the most part, this is a softer side of "Progressive" Rock.