What is the One Test Track That Tells You Almost Everything About A System?

My recent thread comparing Tidal and Qobuz generated a lot of great discussion so I thought I’d try another question for the group.

If you had to choose one track that tells you almost everything about a system, what would it be?

I’m talking about the track you play when:

• evaluating a new component

• setting up a system

• showing someone what your system can do

Ideally it reveals several things at once — imaging, tonal balance, bass control, dynamics, etc.

One of mine is Patricia Barber – “Nardis” from Cafe Blue.

The recording exposes bass articulation, room ambience, and micro-dynamics almost immediately.

I’m always looking for new reference tracks, so I’d love to hear what others use — and what specifically the track reveals about a system.