OS X 10.8 and later only. This script will display an alphabetical list of your choice of the Albums, Artists, Album Artists, Composers, Genres, Groupings, Shows, or Track Names in a selected iTunes library (Music, Movies, TV Shows, and so on) or playlist. This list can then be saved to a text file.
This script used to create a text file of selected tags in the entire iTunes library only, but I have kept its old (and perhaps less-descriptive name) for legacy purposes.
Select a tag and library or playlist and the script will display an alphabetical list of your choice. The list is exportable to a text file.
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Title Cap various track tags, featuring editable exceptions lists