Should slow dancing be base game instead of just part of one pack?

I feel like anything you can do IRL, without the need of special items, should be basegame. So locking the organ-playing skill behind a pack makes sense, but not singing. Plus, those basic functions might be needed for other packs. For example, singing has been used in City Living, Seasons (singing carols), and will probably be needed for any music pack we get.