Suggest one obsure album we all should hear

I love when I discover an album that's new to me, and great.Please share one so we can all broaden our musical horizons.

Mine is:
Wishbone Ash  'Argus'
dweller2  I was going to suggest Wishbone Ash's Argus for the way-cool and melodic dueling guitars, but you beat me to it, so here goes:  Frank Zappa's first CD was a double, Apostrophe and Overnight Sensation.  He absolutely had his best musicians during this era.  The instrumental title track to the former was written for the ex-Cream bassist Jack Bruce, and he romps.  Jean-Luc Ponty appears on violin, and George Duke asks the question, "Why Does It Hurt When I Pee?" , with references to "The toilet seat", and certain anatomical parts feeling like a "Pair of maracas".  Zappa's guitar work also superb, as are his compositions, and we learn about "The Slime oozing out of your TEEVEE set".