UPDATED: Playlist Manager v4.0
For macOS 11 and later only. The Music app only allows one playlist to be selected at a time. This applet can perform common useful tasks on a multiple selection of playlists: playlist title renaming (add text, remove text, search and replace text) and duplicate, delete, export, move to Playlist Folder and merge playlists; change the View As and Sort By settings. (This script will require your permission to access "System Events" in order to run. Please see the Read Me RTFD doc.)
Latest version:
- Adds "Views" section
- Minor performance enhancements
More information for Playlist Manager v4.0 and download link is here.