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There is so much great music to audition with - its really hard to narrow it down to just 1 song....
Sting's A Brand New Day in 5.1 DTS, track #3 "Small World, Big Lie":
Steely Dan's Gaucho on SACD
Talking Heads, Speaking in Tongues, dualdisc, with DVD-A or DD 5.1. Burning Down the House is my best test of drum kicking your butt
Donald Fagan - Morph The Cat
Lots and lots of great stuff out there, but I have to say that I am a bit biased, most of those are in fact great recordings, but they also have very well defined bass portions of their tracks...
Hey - Thats how I do, Don't worry about it...