"Ona słucha smutnej muzyki."

Translation: She is listening to sad music.

[JaniceSchl1]

I know you have a lot to do with these comments. But it would help if someone would just State at the beginning of the comments what case the sentence is in.

[Jellei]

I'd love to be able to just 'pin' a comment at the top, but I can't :/

"Ona" (the subject -> Nominative) + "słucha" (3rd person singular verb) + "smutnej muzyki" (Genitive, as needed by the verb "słuchać").

[ZosiaD5]

Very clear

[tczek]

Is this genetive?

[Jellei]

Yes it is.