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
Midnight Oil, Earth Sun and Moon
The Beatles, Abbey Road, 2009 Remaster
Paul Kelly, May 1992
Neil Young, Eldorado
REM: Automatic Box (contains 11/19/1992 live concert from the 40 Watt Club in Anthens, GA)(absolutely one of the best live recordings)
Ry Cooder, Chavez Ravine
Cat Power, The Greatest
Booker T, Potato Hole
Any of the below will give you the "you are there" goosebumps on a system revealing enough to show it to you.

Benny Goodman: 'Benny Goodman and Friends'
The Benny Green Trio: 'Testifyin'
Bill Berry: 'For Duke'
Carmen McRae: 'The Great American Songbook'
Chesky Records: 'The Ultimate Demonstation Disc'
Clifford Jordan: 'Live at Ethell's'
Eric Clapton: 'Unplugged'
Fred Hersch Trio: The Fred Hersch Trio Plays...'
Harry Belafonte: 'Live at Carnegie Hall'
Hope Waits: 'Hope Waits'
Joshua Redman Quartet: 'Spirit of the Moment'
Kate McGarry: 'Mercy Streets'
Kendra Shank: 'Afterglow'
Lyle Lovett: 'Joshua Judges Ruth'
Various: 'A Tribute To Stevie Ray Vaughn'
Wynton Marsalis Septet" 'Live at the Village Vanguard'
My favorites to check any system upgrades are; Pat Metheny - Secret Story, Dick Hyman - From the age of swing, Dick Dale - Spacial Disorientation.