Questions & Answers about У рояля сидел пианист и медленно играл новую мелодию.
У + genitive often means by, near, or at something/someone.
So у рояля means by the piano / at the piano.
Here, it describes the pianist’s location. He is sitting near the grand piano, in the position of playing it.
A useful comparison:
- у рояля = by the piano, at the piano
- за роялем = seated at the piano, literally behind the piano from the player’s perspective
In many contexts, both can work, but у рояля is very natural for describing where someone is.
The dictionary form is рояль = grand piano.
After the preposition у, Russian normally uses the genitive case, so:
- рояль → рояля
This is a masculine noun, and the ending changes because of the case.
So:
- nominative: рояль
- genitive: рояля
That is why the sentence has у рояля.