Hello. An image is worth a thousand words. Three images are worth much more. 
I assume other MP3s are working?
It could be a “bad” MP3 or it may be a different format named .MP3.
Check the file with [u]MediaInfoOnline[/u]. If it’s actually an MP3in the top section it should say -
Format : MPEG Audio
And in the bottom section it should say -
Format version : Version 1
Format profile : Layer 3
If that looks OK [u]MP3 Diags[/u] can find and repair some MP3 problems. (Make a backup before attempting repairs because it’s irreversible.)