I thought that today you are going to spoil us with some good music.
When I first saw the size of the APK I wondered if you included the music.
All that songs must be a lot of Mbytes to upload.
I think you forgot to include something to that effect
Your app says : No Music Folder ==> Music Player will end ==> OK
I wait for another version or link to the music. I have no doubt that this one is as good as the others.