Help Music didn't appear in the music player

[Baskin]

Some of my music didn't appear in my music player. But it can be found if you go trough the 'My Files'. It just didn't appear in the music player. Strangely the song is playable, but you need to go to the 'My Files' first, and it so complicated.

My musics is iTunes quality and usually just work fine. How to fix this? Sorry for the bad english.