How does solo piano help you evaluate audio gear?

@hilde45  I have found that solo piano recordings that I know well will reveal speaker aberrations pretty quickly.  I also use solo voice, hopefully, SATB, because I want nothing to do with a speaker that does not do voice right.  Not sure why, but I've also found  that good recordings of french horns can reveal aberrations that might otherwise go unnoticed.  If speakers pass these tests, then I go on to other speaker attributes.   I assume you are doing your evaluations at home in your own system with your own music.  Now that you are adept at optimizing speaker/room interactions, you are in a really good place to find a speaker that is going to do well for you. 

I also listen to the hammer strike, the initial overtones, and their decay. Instructive in terms of how the system handles the whole sonic envelope, not just wide frequency range. I’ve had a couple very good pianos, including a vintage Bosendorfer. You can make easy comparisons by ear with the live instrument and a recording. (Every piano, even the same brand/model, tends to sound different. Someone who restores these instruments knows how to voice them to achieve different tone and attack).

The trick is finding good recordings. Either the piano is too closely mic’d or is presented in miniature compared to a full sized grand.

The most important thing about piano is already said here:

So what does piano reveals exceptionally well to my ears?

- musical scale, unlike any other instruments offering an incredible, unparalleled range.

- higher and lower scale in frequency range than any other instrument.

- both treble and bass clef while most other instruments reveals only one or the other.

But i used the human voice first before piano.... Chorus or single voice... Because evolution trained us one million year to recognize a voice anywhere in any location at the risk of death...

After that i use piano also....

Third i used brass and violins...

but never mind the instruments, each playing note must be SEEN to be  a dynamical flowing volume in the room with a micro-structure like a skin with his own texture...

«Sound smell»-anonymus acoustician

Really important for detecting crossover anomalies, dynamics, and tone.

@brownsfan @lalitk and others -- this is great! Thanks so much. I really do find it helpful in addition (of course) to the human voice. There's no either/or in any of this.

What is hard with pianos is that not having heard the piano in the recording there is a huge "guess factor" as to whether component/speaker A or B is getting "closer" to the original. One thing I heard today, though, which is not compromised by that problem was a piano with high notes that sounded like a toy piano. That clearly is a speaker not dealing well with tonality/overtones.