What is your "holy grail song" that you cannot find?

3 Dog Night covered it in 1968. 
https://youtu.be/85PD4epq18Y?si=Mz4jD6aJ81u_nTkd

@judsauce I found "Hot Smoke & Sassafras" on a compilation CD called "The Psychedelic Sixties," which is on the FUEL label. There are currently used & new copies of it on Amazon now at reasonable prices..

@garebear, I think I remember hearing (and liking) George's version of "It Don't Come Easy;" but, I don't remember how or where I heard it.

Both the Smithereens ("Attack of the Smithereens" or "Covers:) and Bettye LaVette ("Interpretations - The British Rock Songbook") have done excellent versions of that song. The Smithereens cd's are easy to find and reasonably priced; but, the Bettye LaVette CD is out of print; so, that will be a pricier option.. 

@whiteknee , I read Jerry Shirley's autobiography called "Best Seat in the House." It is one of the better rock biographies or autobiographies that I've read. Plus, major style points for the title!

Saw Yo Yo Ma on PBS many years ago.  Performance in a castle, I think in Scotland.  Sounded amazing on my old tube television at the time.  Have a fully decked out theater now and can't find even a hint on the internet that the performance ever took place.