These are some I like to test with...I know if you did a search for this topic, you'd find posts Steve and I have done on this very subject.
MECA Chesky Ultimate Demostration Disc (favorite tracks: Spanish Harlem, If I Could Sing Your Blues, Grandma's Hands)
Neil Young - Cortez the Killer
Zeppelin - White Summer, Black Mountain Side
Allison Krauss & Union Station: Live (best tracks: #2 Choctaw Hayride, #3 Lucky One, #13 Faraway Land)
Eagles: Hotel California off "Hell Freezes Over"
Dave Matthews - Gravedigger
Nina Simone - Feelin' Good
Micheal Kamen - Training, Robin Hood Prince of Thieves soundtrack
Hans Zimmer - Black Hawk Down soundtrack ("Gortoz A Ran J'attends" is a chilling test of stage depth)
Dire Straits - Tunnel of Love
Dire Straits - Romeo and Juliet
Dire Straits - Lady Writer
The Who - Eminence Front
The Who - Baba 'O Riley
The Used - Sometimes I Just Go For It
Dream Theater - Stream of Consciousness
*****-Siberian Orchestra - Carol of the Bells, and TSO's version of O Holy Night
Jimi Hendrix - the entire Electric Ladyland album
Crosby, Stills & Nash - Suite, Judy Blue Eyes
Deanna Bogart - OK, I'll Play the Blues
Eva Cassidy - Wayfaring Stranger
Eva Cassidy - Wade in the Water
Coldplay - The Scientist
Pink Floyd - Shine On You Crazy Diamond, Part One
Simon & Garfunkel - Sound of Silence, Scarborough Fair
The Eagles - Seven Bridges Road
The Moody Blues - The Story in Your Eyes