This is the 3666th most frequent Polish word.
indie
"Indie" in Polish means "India."
Here 'Indie' is used as a proper noun referring to a country in South Asia, 'India'.
Indie są krajem o bogatej kulturze.
India is a country with a rich culture.
In this context, 'indie' is used as an adjective describing a genre of music characterized by its independent production.
Lubię słuchać muzyki indie.
I like to listen to indie music.
Here, 'Indii' is the genitive declension of 'Indie,' used to show a relationship or possession in Polish grammar.