Suggest one obsure album we all should hear

Bryan Ferry "Boys and Girls": All star lineup. Used to play this on a long trip when we needed to go that last hour.

Kraftwerk: 3-D Catalogue. Reworked old favorites. Amazing sonics.

King Krimson Live in Montreal: Especially "Sartori in Tangier". Tony Levin bass line alone is enough. Throw in Fripp and Belew. Epic
Gong: Shamal. Mid 70’s space jazz. Steve Hillage guitar!
System 7: Their best album is out of print and not even on Amazon. Listen to what you can. Guitar synthesizer and deep house(I think).

Weather Report Black Market: Jazz fusion. Jaco Pastorius on bass.

Dallas Wind Symphony, Frederick Fennell:  Trittico.  Great orchestra with stunning sonics. 

That’s all I used to buy was "not commercial" so let me know if you want more. LOL

The first (self-titled} Seatrain album. Still love it.

obscure may be the wrong word, it is a new album from a new artist

matt carmichael - where will the river flow

beautiful lyrical jazz, great sound quality

in addition to the absolutely lovely music, it is an excellent test of truth of timbre of a hifi rig

Rick Margitza - Hope
Bob Berg - Back Roads
Dan Siegel - Hemispheres
Randy Roos - Primalvision

Obscure, you say?
Here's a good intro to Harry Partch, a brilliant iconoclastic composer who designed and built his own instruments and employs a microtonic (43-tone) scale:

Music of Harry Partch, Vol. 3: Sonata Dementia 
or
The Harry Partch Collection, Vols. 1-5
by Gate 5 Ensemble