For macOS 10.10 and later. This applet will allow you to view and edit most tags (and some additional options) of the selected track(s) in a single floating window using single-edit mode (one selected track) or multi-edit mode, which emulates the pre-iTunes 12 "multiple items" format; that is, a checkbox adjacent to each tag allows you to select which changes are to be applied to the selection's tags.
Can also be used to copy collected tags from one set of tracks to another set of tracks by toggling "Information Tracking".
Thanks to Wolfgang Reszel for the icon.
Access most tags of a selection of iTunes tracks in a single window. (Sorting tags are accessible via togglable Drawer.)
(via in-app purchase)
Perhaps Also of Interest...
downloaded 2m 51s ago
Batch-change the Album Rating for the albums of selected tracks
downloaded 53m 23s ago
Perform search-and-replace on text in your choice of tags
downloaded 1h 1m 28s ago
Exports and then re-imports selected tracks' artwork
downloaded 1h 12m 41s ago
Three scripts assist with editing Work and Movement tags
downloaded 1h 14m 57s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 1h 24m 43s ago
Gather audio tracks whose files contain no artwork metadata