Using very bright and very dull CD's to test the extremes.

I'm interested in finding out if you use a very bright and/or very "dull" CD for auditioning equipment, and if so, which ones you would recommend. I have found Fleetwood Mac's "Rumours", for example, to be lacking in detail, air and top end, but useful for determining if equipment would render this fine album unacceptably "dull". Thanks for you help. Steve