#FreeSoftwareAdvent today is #EasyTAG!
https://gitlab.gnome.org/GNOME/easytag
Point it at a directory of music files and it shows a spreadsheet-like view of their tags. Make bulk changes by selecting files, updating the tag, and hit T+. Easy! (just like the name says). Even supports bulk adding images.
And a bonus one today #Kid3!
This is also for tags, but is maybe less easy, but more powerful. Mostly I use this when I really need to clean something up.

