There are plenty covers of Czesław Niemen's songs but there arent any original song. Like real Spotify, we need this its a big part of Polish and European culture. Songs like Sen o Warszawie, Pod Papugami or Wspomnienie are realy famous and i dont see any reason why i cant listen them in spotify.
Hello and thanks for the feedback! Spotify is always trying to add as much music content as possible. If a track/album/artist isn't available (in a certain country) it's mostly the decision of the artist or their label. For more information about that topic, please have a read at point 5 of the official FAQs respecting additional music requests here.