For each selected track whose Song Name starts with a number (0-999) the script will copy the number to the track's track number tag. Use carefully; be sure the number is not part of the actual Song title, eg: "12th Street Rag", "5:15", "99 Red Baloons", etc.
This script also used to remove the track number text from the Song Name, but no longer does so. If that is necessary then use Remove n Characters From Front
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Copy number prefix in Song Name of selected tracks to their track number tag
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Copy Artist to Album Artist of selected tracks
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Use tag data to formulate new file name for selected tracks' files
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Sort purchased tracks into discrete playlists by name or Apple ID