If you want to “Plex Dance” the entire library, you could just delete the library itself in Plex, and re-create it.
Renaming the folder that Plex is pointing to (or removing the pointer Plex is looking at in the “Add Folder” dialog) would work just as well as re-creating the library.
I had assumed you had just one or two albums that were broken, not the entire library’s worth of metadata.
