I only believe in 2 systems - one for "us"(family) and one for "them" (guests).
I just want to be in one cozy room. I don't like the idea of going to one room for music and another room for movies.
If I had 2 empty rooms, I would make one room a music/movies room and make the other a guest bedroom. Where would your daughter sleep when she comes back if both rooms are used for music and movies?