Which CDs to test a component?

I agree with Chelillingworth I always use things that are famaliar to me, ie things I have been listening to lately. I tend to use male and female vocals, we hear them all day long and any inaccuracy is easily heard, nothing is more ear piercing then a shreeking female vocal that shouldn't sound bad. Always real piano recordings, they sound much better then digital/electric piano's(preferably a steinway), listen for the real sound of the piano, make sure it sounds linear at all frequencies. The ultimate test is if it(a piece of music) gets your foot tapping at home, it should to the same to what ever your listening to, or keep moving.

cfb-Your intrest in Kid a surprises me, I found it to be way to confusing, perhaps I don't have the cerebral capacity to compute it. Any way enjoy it :)

Everyone-Thanks for some new suggestions!!! keep 'em coming!