Music to test with:

Anything by Celine Dion. If the rig makes it sound good it must be great.... buy it.

Sincerely,
I remain,

If I find a system that makes Celine Dion sound good I'll market it and get rich. Singers like her were the reason for scan buttons on the radio.
I forgot about the Lyle Lovett, I use several of his recordings too.
I don't buy or audition things often enough to get tired of my test material. At least not so far. I'm just wondering what I'm missing or should try next time.

...please spin on the Fifth Movement of Berlioz's "Symphonie fantastique!" You'll know when you hear it, if you got it all. Regards!
Also it doesn't make sense to me why would anybody test, or audition HIEND equipment with rock noise/music??

People buy HIEND equipment to listen to the music they like. Classical music is no more intrinsicly better than rock than Bach is better than Mozart. Why would someone who loves Frank Zappa or Neil Young (neither of which I like) buy a Berloiz album to test their gear?

Actually, there is an excellent reason for using music created with natural acoustic instruments rather than synthesizers or other esoteric electronica. We know (at least musically educated people know) what an oboe, piano, violin, upright bass, or snare drum is suppose to sound like. Nobody really knows what an electric guitar washed through five or six little black boxes is supposed to sound like.

If your concern is only to find a sound that you like, then you can of course use any source you want. If you desire an accurate reproduction system, you'd better start with a known source.

will