A free program for Android, by MEsoft.

More and more people have listened to audio files on the go, but not everyone has time to rearrange files of music into their playlists. MePlayer is a Folder-based simple MP3 player that makes music management easy. Now you just need to download songs from your computer with folders, and MePlayer will show them to you. Moreover, the MeMusic series offers new ways to search songs by genre (like Genre Funky), year of release, album cover images, and more. 

This handy app also supports the app Widgets for easier access. MePlayer Music is a free android application that is available for Android 9.0 or above