If I have the same version of a song on 4 different playlists, should that song be listed four times in the library or only once? I ask because I was scrolling through my library and saw a bunch of duplicates, but I wasn't sure if deleting a duplicate listing in the library would delete that song from a playlist.
Hi and welcome back to macosx.com
(1) No, one entry in the Library can be referenced in several playlists
(2) if you delete a song from the library, it would be deleted in any playlist in which it is referenced.
On the contrary, deleting a song froma playlist do not delete it from the library
May I also suggest you the Doug Scripts for itunes ?
http://www.dougscripts.com/itunes/index.php
A bunch of Applescript which will help you in your daily management of iTunes tracks. I'm sure you'll the scripts which help you to track duplicate or dead tracks
Regards
Philippe