I'm thinking the media player should do that automatically.
Which media player are you using?
With WMP right-click the bar just below the title bar. This will show the Menu bar, since it is hidden by default. Then select [Tools > Advanced]. There you have the option between "restore media library" and restore deleted library items".
There is an option to force the player to look online and download the library information again. I know I've done it before. In fact I've gotten ticked off with the library automatically making changes, so I turned the auto feature off so I could make corrections and have them stick. This is why I thought it was an automated feature by default. It has been awhile since I have allowed a media player control of my MP3 files, so I'm a bit rusty. I do know that what you ask is possible, just have to find the right option.
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