Suggest one obsure album we all should hear

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