This is the 14613th most frequent Turkish word.
piyanonun
"Of the piano" or "the piano's."
In this sentence, 'piyanonun' means 'of the piano', demonstrating possession (genitive case).
Piyanonun sesi çok güzel.
The sound of the piano is very beautiful.
Here, 'piyanonun' represents 'the piano's' combined with 'üzerine', indicating spatial relation concerning the piano.
Piyanonun üzerine bir kitap koydum.
I put a book on top of the piano.
In this example, 'piyanonun' means 'of the piano' to specify possession (genitive case), linking it to 'bakımını' (care).