Additional information in case Noris’ suggestion does not work and with the caveat I have not used iTunes or Apple formatted music.
Sometimes audio files, MP3, Flac, etc can have a problems with the file header. Some players will just ignore these issues and just play the file and some will not. To correct the issue on some MP3 and FLAC files I owned, I had to bring them up in audio software and then re-save them as the same file type. This rewrites the headers and cleaned things up, for me.