Actually a subject. When it was my Sony Xperia (which being sealed managed to die from moisture) and it was very convenient native app with a catalog of all the music on the phone. Ie, when run, sanila entire phone on the subject of what is, rocked the tags, images and so forth. Then it could be convenient to list all listening.
The actual players in the market is the sea, but is there anything such is not under Sony? Can be reasonably paid.
The issue is not the topic, but there catalog if you want just a few hundred мр3шек?
And how the program will look for tags and pictures? By file name or what?
In most svejesobranna MP3 filled not only tags, but also album art stored. Ie if the player is able, it will show cover art and other info.
I do not know whether such information is in flac, but they still listen to it makes no sense. And in MP3 is.