Why did i find some music in my google play music? Am i being hacked

[Android Central Question]

Um i found some music in my google play music that I did not download.. u have any ideas wut is that? Am i being hacked or something? I download all my musics from a site called Mp3juices.cc. My Mom also uses that site so of course she must check if its safe or not, so she says its safe. I think most of those musics came from my system update, or a gift from an app. Until now my mobile is functioning properly, but my problem is with the other musics that i probably didnt get from an app or system update. Any ideas wut is that? Thx