Marbletown is the new TOL
a little bit exaggerated IMHO
Marbletown is a folk-bluegrass jam, without a doubt fun to play for 2 or 3 band members, (maybe) fun to listen to some extend, but certainly not an elaborated piece of prog-rock like Tunnel of love was, mainly during the BIA tour.
Marbletown is "just" musicians jamming over (almost) the same chord.
TOL is a sophistically (even not as such sa TR) piece of music, a very well constructed structure iwth intro/verse/chorus/bridge, etc...
so to me it's not comparable
I like jamming, no problem with that, but it's not the same as a song composed in an extended way
Even if TOL was extended live, it was already a long piece in studio. It's not the case for Marbletown.
Sure, Marbletown is "extende stuff" in term of song duration, but not in the same way as TOL or TR are, or as OUATITW, WWE, Sultans, were "extended" in the 80ies.
It's like if you would say that Bohemian Rhapsody, Stairway to heaven, close to the edge, tubular bells or Supper's ready are "extended stuff" just like voodoo chile, Red house, same old blues, or refried boogie (almost 40' !) by Canned heat