Next to MP3 and WMA, this new app that is still in beta can also handle FLAC and AAC files, but only works with devices running at least Android 6.0 Marshmallow.
http://www.notebookcheck.net/Samsung-Music-app-now-available-via-the-Google-Play-Store.161330.0.html
woww.... I love this app more than Walkman by Sony, very easy to use. I even got this app for my PC from http://choilieng.com. A very nice app