A Piano Mobile is a vehicle with a piano in it.

Wikipedia:

The piano nobile (Italian, "noble floor" or "noble level", also sometimes referred to by the corresponding French term, bel étage) is the principal floor of a large house, usually built in one of the styles of Classical Renaissance architecture. This floor contains the principal reception and bedrooms of the house.

The piano nobile is often the first (European terminology, second floor in US terms) or sometimes the second storey, located above a ground floor (often rusticated) containing minor rooms and service rooms. The reasons for this were so the rooms would have finer views, and more practically to avoid the dampness and odours of the street level. This is especially true in Venice where the piano nobile of the many palazzi is especially obvious from the exterior by virtue of its larger windows and balconies and open loggias. Examples of this are Ca' Foscari, Ca' d'Oro, Ca' Vendramin Calergi, and Palazzo Barbarigo.

Larger windows than those on other floors are usually the most obvious feature of the piano nobile. Often in England and Italy the piano nobile is reached by an ornate outer staircase, which negated the need for the inhabitants of this floor to enter the house by the servant's floor below. Kedleston Hall is an example of this in England, as is Villa Capra in Italy.

Most houses contained a secondary floor above the piano nobile which contained more intimate withdrawing and bedrooms for private use by the family of the house when no honoured guests were present. Above this floor would often be an attic floor containing staff bedrooms.

The place to party.

A noble try but not quite pianissimo.

The piano belonging to Queen Daenerys Targaryen (GOT)!

A royal piano?

I think Roy Kelley has the right answer!

A piano that has no bile because its owner had a gallbladderectomy.

Roy Kelley has this one.

Tony and Suzanne Marriott, Associate Brokers The main floor of the house where the piano is located.

It's those group of guys that we never know where they'll show up to play with their grand piano.

Something I-talian.

Special addition Liberace cell phone! It works in a safe room!

I had to Google it!! did not know, but now I do....

This one I know, so no smart retort!

The main floor which is a matter of choice!

Has to do with fancy flooring.

Nimble fingers on the keys of a piano?

It's where I end up after too much Prosecco.

A virtual piano keyboard? Though I do like Ryan Huggins - Thousand Oaks, CA 's answer.

A piano owned by the nobility?

Sounds Italian and I should know this one! I know what the words mean but together??? I am going to guess regal entry foyer.

Those little white things that people hit when playing the piano

Tony and Suzanne Marriott, Associate Brokers - okay so board was more than what I thought....

And Piano has something to do with music....

This is above my head. Glad we don't use these terms in today's construction.

Is that one of those things you hang over a baby's crib that plays piano music and keeps them from crying?

Sounds like this is a great musician

Elton John

I now know what a piano nobile is, thanks to Roy Kelley 

Stationary one

A very very proper and well born instrument? lol

Wishing you and your's a very happy, safe and prosperous new year!