My DS has had a Sonos system installed in every room downstairs and, I believe, in the main bedroom. Using the Sonos App on his iPhone, and subscribing to Spotify, he can access all the music that was ever produced in the world and play it in whatever room he's in, or in all the rooms at once. Don't ask me how much it costs - I imagine it's very expensive, but probably just for the initial layout of the speaker installation and wiring. Once that's done, it's just a monthly subscription (I think, don't quote me!)
Oh, and the sound quality is amazing, it just fills the room.