what are the "must have" CD's


For years, I've invested in quality sound equipment and have a small collection of CD's of different types.....but I realize that there are problaby some "must have" CD's that really show just how good (or bad) a system really is. This isn't a quest for who your favorite female singer is...or what orchestra you like the best....I'm really after sonic quality and sonic range (gotta show off the sub and boomy rock probably isn't the best way to do it).

I'm open to suggestions in most any musical category...the only qualification is that the CD has to be readily available and not some collector's item.

If there is already a list somewhere..please point me to it....or post your suggestions.
ghstudio
With the caveat that the music must be good I would recommend:

Arturo O'Farrill "Live In Brooklyn"
Leonard Cohen "Live In London"
Maria Rita "Samba Meu"
Gordon Goodwin's Big Phat Band "The Phat Pack"
Marcy Playground "Eponymous"
Bebo Valdes & Cigala "Lagrima Negras"
Tudo Azul "Vehla Guarda da Portela"
I often start off with Norah Jones. Her stuff generally sounds pretty good and people usually hear it sounding pretty bad.
New Order Substance....sonically, it's got everything and then some. decent recording that will test your gear well when things get loud. good music to boot imho.
These discs are sure to put smiles on the faces of your guests and all of the music can be enjoyed and understood by many.

Mannheim Steamroller "Fresh Aire Seven"
Diana Krall "Loves Scenes"
Sade "The Best of Sade"
Nils Lofgren "Acoustic Live"
The Rippingtons "Curves Ahead"
Natalie Merchant "Tiger Lilly"
k.d. Lang "Drag"
Shawn Colvin "Fat City"