iTunes 12 metadata: the "description" field
I've just upgraded to iTunes 12 and seem to have lost the option to update the "description" metadata field for my music. When I choose "Get info" for a file the new format appears but "description" does not appear.
The field is still available to view for old files and the details I have added previously remain visible - but there does not appear to be the facility to edit the previously added information and it is not available for new files. I think the field is primarily intended for video files and is still available to be updated for videos - but not for music files. However, I find it a useful "spare" field for some additional information in my music files and would like to keep using it if possible.
Can anyone advise me on how to access this useful field for my music files?
iMac (21.5-inch Mid 2011), Mac OS X (10.7.5), iTunes 12.0.1.26