Apple has issued iTunes 12.1.2 with support for the newly released Photos app in OS X 10.10 Yosemite (see “Apple Releases OS X 10.10.3 with Photos,” 8 April 2015). The Apple support page also notes that the update “adds several refinements to the Get Info window,” which are mostly evident in the rejiggered Details pane. The fields have been shuffled around to consolidate the album and artist fields at the top, and the track and disc numbering fields have been moved a little higher as well. (Free, 205 MB via direct download or 104 MB via
Software Update, 10.7.5+)
That's odd: my 12.1 has the fields in the right pictured, plus following them, disc number, track, compilation, and play count. Have you tried expanding the window? Seems odd there's no longer a comments.
I got a Comments field alright. Maybe scroll down a bit?
My 12.1.2 will not start up.
In the case of radio stations:
Track info > File: the content of the Location field now is copiable, although still not editable.
Note that there was no iTunes 12.1.1 release.