While obscure is highly subjective, I love this post! So I will post more than one suggestion!
My top two "out there" pics are in the new age-ish category (though new age does these recordings a disservice):
- Deux Filles - Silence & Wisdom
- Popol Vuh - Aguirre
If you are into the ECM jazz label, which could be obscure for some but hardly so for others, there is one release that is an absolute gem without much attention:
- David Darling - Cello
I always loved these two 80s releases which never got too much attention (though some may disagree) ... these are in the 4AD / Dead Can Dance genre:
- This Mortal Coil - Sixteen Days/Gathering Dust EP
- Colourbox - Best of Colourbox 82/87
For a last song recommendation, something from a well know band:
- The Clash - Bankrobber/Robber Dub from Black Market Clash