Same CD/Album or Music ,In cable comparison,

What dose the Audiogon community think. I have read alot of cable comparisons on Audiogon and other sites , all or most all end up saying (an should) that its your ear and your system. So I was thinking ,if at least the music was the same on all comparisons , we would have a constant to talk about. Say 3 CD/Album , 1 Rock , 1 Jazz and 1 Classical and 5 or so other songs. Well if this idea has come up before , sorry I missed the thread or if this is just not a good idea.

Thanks Russ