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Sounds like what you have are "cross linked files". These are usually found in FAT filesystems, because FAT is a non-journeling fileystem. FAT is almost for sure the filesystem that your MP3 player uses - I haven't heard of MP3 players that use other filesystems. Cross linked files are typically caused by improper shutdown of the operating system (like yanking power in the middle of file write operations) or by poorly written and misbehaved applications.
If your MP3 player uses a removable microSD card to store your file(s) that are now damaged, in theory you should be able to remove that microSD card, insert it into a Windows computer, and run chkdsk (or on a Linux computer, run fsck). These programs MIGHT be able to correct the filesystem damage. If your files are stored on internal memory in the MP3 player, you're probably out of luck in fixing them. You can remove them or re-format the MP3 player (if it allows that), and start over by adding your files back from scratch. Note that one damaged file does not mean that other files will be damaged. Nor does it mean that they WON'T be damaged. You may have one isolated corrupt file, or you may have many.
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