Cleanest CD recording to test with

and naturally:

Chuck Mangione - Childrens of Sanchez ...probably high om DR List :-)

Lou Reed - Berlin: Live at St. Ann's ...Men of good fortune (Live but needs to be mentioned)

Did I forget
Muddy Waters - Folk singer 
Shame.

+1 Jamie Cullum. Discovered myself earlier this year. 

Listening right now to The Teskey Brothers "Half my Harvest". Sounds very promising. Try "Hard Feeling" and then "Honeymoon". Great NEW recording. Like Leon Bridges. THEY ARE STILL MAKING FANTASTIC WELL-RECORDED MUSIC. 

Theres so many. Roseanne Cash made an acoustic "demo" a long time ago. Don't miss Radka Toneff, Eva Cassidy, Nancy LaMott.

Maybe they don't count but studio acoustic lives from Lynherd Skynherd, Nirvana, Alice in chains.

Guy Davies - Sweetheart like you
Bill Evans - Waltz for Debbie
Joss Stones - Soul sessions (first track is CLOSE)
Eric Bibb - Spirit and the blues
Jazz at the pawnshop
Featuring Norah Jones
A lot with Leonard Cohen
Cowboy Junkies - Trinity 

Need to stop. Will be back. 

If you're into Classical music. Look out for the record company BIS (e.g. Gothenburg Symphonic Orchestra). The often have a warning for huge Dynamics that might hurt your system on their records.

I add Radka Toneff - "Live in Hamburg", Cécile McLorin Salvant "Dreams and Daggers" and Cécile Vemy Quartet - "Memory Lane". All live and natural. 

REM - "Automatic for the people" - don't miss demo tracks.

Better I think would be to do the testing with music that you feel have the potential to sound "better" than it does with your existing components. The best recordings sounds perfect on anything. 

+1 Greg Brown

Hans Theessink - Call me

Too obvious to mention? Bass tuba!

Did not find Andy Gravish on Tidal but a cd by Kimiko Itoh where he participates a little. Smooth jazz you heard before but quite refreshing and very well recorded (as it appears in my phones).

Dixie Dregs - Dregs of the earth

Martyna Jakubowicz - Patchwork