Windows only: Music application TuneUp scans your iTunes library to fill in and clean up your music's metadata, including album art. After you install it, just point it at songs in your library you want to clean up; TuneUp fingerprints and analyzes them and then provides a diagnostic overview of your missing or incorrect metadata. You can then verify and clean up all your metadata with the stroke of a button. In theory it's very similar to previously mentioned MusicBrainz, but it's an altogether fresh take with a few more features.

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