Foobar just makes the hidden playlists of other players all explicit. That doesn't preclude what you're asking for. The best way to do what you're talking about

Foobar just makes the hidden playlists of other players all explicit. That doesn't preclude what you're asking for. The best way to do what you're talking about is probably with the Facets component or the search functionality of the columns_ui interface. You can do it with the default library search but it will switch out the playlist that's playing as soon as you search for something else.