When adding already downloaded, and purchased, songs to a playlist some of them got undownloaded. Can't add my own mp3s to a playlist. Apart from the "purchased" playlist with everything in one giant list, there is no way to filter and see what songs/ albums you have actually purchased. As for the other reviews about downloaded purchased music going missing, for me it was android/data/com.amazon.mp3/files/music/purchased. The songs I had to redownload due to my first comment were there.