Music note often means missing file, but if there is that small error in front and you can expand it, it means "multiple files attached". Might be either you have this file for "Boyfriend" twice, or one is the correct "Boyfriend" and the other one is an entirely different song (or at least a different version of the same song, e.g. single version instead of album version or so) just matched to the wrong track.
Select one of the files and have a look at the metadata comparisson at the bottom. The one that is green should be pretty clear, probably a correct match. The yellow one should have some existing metadata that does not quite fit.
If you want to correct it, you can drag and drop files onto another track or onto another album.Or if unsure just drag it to the left side again, finish tagging the rest and come back to the unmatched files afterwards.