This script will allow you to merge the track contents of two or more playlists or delete any number of playlists at once, including Smart, Genius, and Playlist Folder playlists. The merge feature will prevent the same tracks that may appear in different source playlists from being duplicated and has an option to delete original playlists. The delete feature only deletes the playlist; tracks, of course, remain in the library.
Very handy when assigned a keyboard shortcut.
Also see Delete Empty Playlists.
OS X 10.6 or later only. Previous universal version (without the merge feature) available at the link below in the "Info" section.
About to merge two selected playlists to a single existing playlist. The tracks in the two selected playlists will be copied to the target playlist.
Perhaps Also of Interest...
downloaded 4m 54s ago
Re-locate files of selected tracks to new folder, preserve track meta-data
downloaded 7m 24s ago
Display, create text file listing info of dead tracks
downloaded 15m 14s ago
Exports and then re-imports selected tracks' artwork
downloaded 22m 28s ago
Export files of tracks in two or more playlists to single folder
downloaded 23m 11s ago
Locates pairs of track entries pointing to the same file
downloaded 31m 45s ago
Convert selected tracks and export the converted files to a new folder