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

Anything by Rory! It still shocks me how many people still do not know of him.

UFO Mechanic Michael at his best.

I think you are looking for titles a little off the beaten path so my nomination is for Col. Bruce Hampton and the Aquarium Rescue Unit - self titled live album. These guys are sort of a cross between the Allman Brothers and Frank Zappa and the album is one of the best live recordings in my collection. The musicianship on this album is stunning.

Top on the list for me "Midnight Mood" .Unison music. Only available on the used market. Personally I can't get enough of this CD

second on the list," Between The Lines " Jazz Cafe

Both albums produced by Mark Baldwin

Guaranteed music you have never heard before.

Saint Louis Symphony Orchestra - New World Records 

Slatkin conducting 

Michael Colgrass -Deja vu / light spirit 

Jacob Druckman- Aureole

Many more gems in my archives!

kingbr, second the Diana Krall SACD.  For something completely different, Point Yellow, Dolby Atmos edition...the "stage" moves around the room using various pairs of 7.1 speakers.