Meta Data corrupted.

Music on iPhone:

Files being mislabeled and messed up on iPhone after syncing is a well discussed issue here. Take a look at those discussions for any suggestions. If the problem occurs only on iPhone, clear the entire library from iPhone, restart the device to clear its cache, then try syncing afresh.

iTunes on Mac:

If this is a result of iTunes Match mislabeling, then please search for this term and post with a title that makes this clear. I’ve seen other similar posts. I don’t use “matching” services exactly because the matching algorithms could never deal properly with my collection, so I can’t help.

Before doing anything drastic, make a backup of your current library.

If you made a backup before this occurred, try afresh with that backup.

If the files are in iCloud, create a new, empty iTunes Library and let it populate from iCloud. To create a new Library, or open a different Library, launch iTunes while holding down the Option key.

iTunes has an option to download missing artwork, but not to check, or complete other tags. Purchased music can be deleted, then redownload Ed. Take a look at MPFreaker from LairWare if you think it might help. The developer is very responsive, so you could actually ask him if he thinks it would do anything in your specific case.

https://www.lairware.com/mpfreaker/

None of the utilities or Apple Scripts that I’m aware of can overwrite the Album tag on their own. Something like MPFreaker can certainly find what album a song comes from, but for best results you would need to clear that tag first. As is, you might as well change the album name manually. Sorry.

[I’m assuming you know enough to only modify metadata from within the app, not directly on the files in the Library files.]

BTW, “clear the entire library from iPhone” means stop syncing and remove fro storage in Settings, not delete all individual songs.