ok just audio even easier .. just create a new view under the audio root from the tree (probably a blank one, but you can choose a pre-fab model if you want) (or from the appropriate option area for remote or theater modes). When choosing the categories you want to include choose Playlist Group instead of a tag field. You can also add additional criteria. You can even have all playlist show up create another one and add just one or two of your premade groups or add genres, BPM artists, whatever to further filter ... so yes you can filter on a playlist. Bear in mind two things
1) If you choose to show all playlists (which would inlcude your smartlists -- some of these can be really cpu intensive (like admin smartlists) I have more than 100K flac audio files and I can crash the program or have to wait 5 minutes for it to show!); for me I need to choose individual groups as I have a bunch of regex based expression smartlist that load if I choose the "show all" option. You don't want a smartlist searching a big collection to show missing artwork or dead links for example in your view.
2) this will not retain your original sequence order (well there might be ways to do this, but for random -- guests-coming-over stuff this is probably not needed
here's a screenshot, might be easier to understand ??
I just created a test playlist group, and I would have to know the names of the playlists that someone would enter, right? Or is there a way to allow a new playlist to be added to a group automatically?
Or did you mean grouping the items I know and excluding those, thus leaving the ones i wouldn't know (newely created) as in the root?
sorry I have no idea what you are getting at here ? Who is someone? The "Someone" has to know how to create a playist, if its not you right? . if they know how to create it they can easily learn how to put it in a group (or you can just drag it into a group later). Now if you are talking about a smartlist -- that's different. But just create it in the groups you are interested in or drag/cut/copy later whatever you prefer. As long as you know the name of the group (or it has a name that is understandable like "dinner music" or "party animal") should be pretty obvious ... you could even add a second tier if need be. Maybe you could be more precise what you want to do with some examples. Have you read the wiki on smartlists and playlists btw? Using the "send to" option by right clicking on tracks might be what you are looking for? Not sure. You could create a "general playlist" group which could be your default ... but that doesn't mean it would be totally automatic. Again not sure what you want to do
To avoid system crashes or views that take a lot of time to load you probably only want to load simple smartlist queries as I said before (like newly imported not played etc) or just normal playlists.You would probably want to change the sort order of the view too (or you could just play all the tracks in random mode), after choosing and/or filtering the lists themselves.
Hope this helps get you started at least