I found simple app for directory music playing. The idea is good, but the app not optimised for e-ink display 
In MK i store only selected music files with “artist_name-song_title” file name scheme.
This way the files are sorted alphabetically and played in the same way.
If anyone knows of a similar simple app, please share.
I just use VLC for music
I stumbled upon Odyssey for music playback. It supports folders, too. But you need to set a default folder to make it easier to find your music quickly, and also put ‘Files’ the default screen. Works well enough for me until Mudita fixes their music app.
There are many programs, but the key word here is simplicity.
Most programs are heavy and loaded with many unnecessary features. Think about this how many features you use in dayli use.