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

The album "Nightbirds" by Labelle with the song Lady Marmalade is not available for streaming or purchase. I managed to find a used CD on Ebay for a reasonable price but it's pretty rare. 

Weird nightmare meditations on mingus, in vinyl.  I have been told it happened but very very few made.  CD is an easy find, vinyl oh well. 

@garebear, speaking of George Harrison, one that seldom comes up is Beware of Abkco.  Total bootleg, just pure George, all talent and very little production.  I believe some of his finest work.  I have played for many with wide eyed awe at how great he was. 

George Harrison’s version of ; “ It don’t come easy “ whom he wrote for Ringo Starr. I really like George’s version but cannot find it anywhere .

It is on GH’s "The Concert For Bangladesh" release.

Bartok "Concerto for Orchestra" played for a live audience in the Royal Albert Hall, London. This performance was shown on a PBS tribute to Sir George Solti in the late 70s. Sir George gave an inspired performance, and the crowd went absolutely wild at the finish. The broadcast was hosted by Bill Curtis, long-time Chicago News Anchor, and had interviews with Sir George focusing on his time with the CSO.

Would love to have this video.

A  song called "Gold",by John Stewart,with Stevie Nicks and Lindsey Buckingham. Can't find it on Tidal  or Qobuz.