I would like to know whether a song is used in any playlist(s). forScore has this feature.

My library has duplicates of the same song with numbered names or slightly different names.
If I look at my song list and delete a duplicate version, I don't know whether it's going to disappear from a playlist. Often I have a preferred version (sometimes I've made my own chart of a song), so I'd like to be able to use that version in any playlist the song is used. But there's not an easy way to know which playlists a song is used in.