Apps with 'Folder player' feature
Lisna is a folder tree type music player. It's free.You can play sounds by walking the folder structure, just the way you use explorer on PC.
Lightweight folder based music player.Features:-Local lyrics search by tag-Quick lyrics translation with extarnal apps-Customizable text, background, icon color
Simple to use music player for all those who prefer folder structure over tags. (You want your mix folder, not separated by artists, right?).
Qik Music Player is one of the most powerful and stylish audio player for Android. With three audio widgets you can play music fast and easily. Music player supports almost all type of music files like mp3, wav, ac raw and many other.