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Just Create New Soup Playlist=>Add Tag Layer=>Title. I /think/ that will do it. I seem to recall there is a virtual tag that tells you the number of members of a playlist (size maybe on a playlist?). So inside there, if you sort by size (or whatever it is), you should end up with all the ones that have a count > 0 for a title at the top. I've never really tried to soup on a title though. It might churn for a while.