What is the VERY BEST CD album you've ever heard?

A 1990 CD by the Music & Arts label called Glenn Gould - Previously Unreleased Performances of Works by J.S. Bach, 1957-1969.
This is a tough CD to find. I lucked out. It’s on YouTube. There’s also a live performance on YouTube of his unbelievable performance/conducting of Cantata No. 54.

It’s a favorite because it’s so hard to find, is not available in any media other than YouTube and contains such incredible music.

There is a version of the Soundtrack to David Lynch’s Mulholland Drive on multiple formats (the vinyl pressing goes for $400-$700 presently on Discogs) but the CD is great if for the sole reason it a) doesn’t cost $500, and b) has Rebekah Del Rio’s performance of “Llorando” (an a cappella Spanish version of Roy Orbison’s ‘Crying’) which may be the greatest vocal performance I’ve ever heard.

A lot of Todd Garfinkle's MA Recordings qualify. Off-beat international music minimally miked in carefully selected, acoustically lively locales.

I don't see the need to ram music into categories like whether something is 'rock' or 'pop' - people who don't like it won't see any difference between them and (most) people who like them don't really care what you call it. 

@tylermunns - 'Mulholland Dr' is my favorite movie; I've had the CD since it came out; shame I missed out on the LP, but such great music; I think the title theme is one of Badalamenti's very best.... 

Beatles isn't a rock band. It's pure pop. Calling it rock is delusional.

That's a bit bizarre. Obviously, you're not aware of the rock tracks.

Damn..I’m afraid to post .. I might be delusional.