What is they best album out there for showing off the sound quality of your system.

Btw, all cd`s will sound cleaner if you first rip them to hd and the burn them back to cdr`s. 

I was listening to A Night at the Opera by Queen last night, and of course Bohemian Rhapsody is an obvious choice, but the canon sung by Freddie during The Prophet's Song is just wow!

Stereo Sound Reference Record Volume 1 - Okihiko Sugano Selection
Rossini Overtures - Gamba (Speakers Corner)

I would probably use the following:

CD/SACD:

Vivaldi Concertos for Oboe and Bassoon (Astree label)
Vivaldi/Handel: Dixit Dominus (La Nuova Musica-Harmonia Mundi)
Cowboy Junkies: 'Neath the Covers
Nouvelle Vague: Nouvelle Vague
Brahem Anour: Thimar
Stefan Battaglia: Re Passolini
Harry Connick Jr.: When Harry Met Sallie (soundtrack)

LP:

Any M&K Realtime record, particularly: Bill Berry All-Stars-"For Duke," Earl Hines-"Fatha!"
Any East Winds (Japanese jazz label), particularly: Great Jazz Trio-"Direct from L.A."
Rollins: Saxophone Colossus (one of the best monophonic recordings ever)
Yamamoto Trio: Midnight Sugar (Three Blind Mice label)
Clark Terry: Alternate Blues
Shostakovich: Piano Trio No. 2 (Beaux Arts Trio on Philips)
Mozart: Clarinet Concerto (de peyer/Maag-King Records reissue of Decca recoding)
Van Morrison: Astral Weeks and Moondance
Grateful Dead: American Beauty
Ricki Lee Jones: Girl at Her Volcano
Michael Jackson: Thriller
David Peabody: Americana
Marvin Gaye: What's Going On (Mobile Fidelity One Step)

Norah Jones Come Away With Me - Analogue Productions LP
Getz/Gilberto MOFI 45 RPM LP