What's the difference between piano scores and piano sheet music?

Nothing.





Piano scores is more often the term used in the classical wing of the music building.





Sheet music is more of the term used in the Jazz / Pop / Musical theater / other genres wings of the music building. I'm guessing the term sheet is common because a lot of pop songs are only two to three pages, so were loose sheets of paper. Most classical sonatas, even singly, are always bound editions, whether soft or hard covered.





There are orchestral reductions of orchestral scores (music) done so a pianist can accompany an instrumentalist or singer, concertos and arias all have piano reductions so the singer or player can rehearse, or present the work in a solo recital.








best regards, p.b.What's the difference between piano scores and piano sheet music?
They are the same thing.





There would be a difference if you were talking about a piano score and a piano reduction. A reduction combines the orchestral parts down to a piano score. Reductions are often used for vocalist rehearsals and recitals.What's the difference between piano scores and piano sheet music?
No difference. I use the term sheet music for almost any piece of music I purchase from a sheet music store. I never refer to them as a piano score store.