For macOS 10.10 and later only. This script can be used two ways:
When run as an Applet, it will use the assigned artwork from the selected tracks in iTunes as the icon for the folder containing each track's corresponding file in the Finder--presumably, this is the file's "Album" folder.
When launched as a Droplet--by dragging one or more folders to its icon--it will examine every folder (at all depths) for the first audio file in any folder that contains image metadata and use that image as the icon for the that folder.
Select a playlist of tracks or a batch of specific tracks, click OK and watch as each artwork image is applied to the file's folder.
Or drag-and-drop folders from the Finder that contain audio files.
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