Last week I went to listen to the Gallo Ref 3's on Musical Fidelity gear and brought:
Herbie Hancock Headhunters to test for low end bumpin and funkability.
Vivaldi concerto for strings (Dorian), transparency on more delicate tracks and imaging.
My Phish 2/20/03 allstate FOB: DPA4022(ORTF)>V3 to see how well the live sound and big bass of a PA system translates to playback.
Dead 5/8/77II just because I am very familiar with this disc, love the fat round low end and Jer's vocals.
Beethoven symphony #5, Benjamin Zander conducting, Telarc records.
Delos records has some cool CD's called "engineer's choice" with a variety of very high fidelity tracks from a variety of sources.
http://www.delosmus.com/As well as some classical piano, violin, and vocal recordings I have made recently. All DPA4022(ORTF)>V3>VXpocket (24/44.1)>Waves L2 dither for CDR.