With a multi-room system, you have the choice. You can play the same music in all the rooms of the house, or in a set of pre-defined rooms, or you can listen to different music in each room.
Broadcast from many different music sources such as the on-line music services Spotify, Deezer, TuneIn, Qobuz and many others. You can also use music shared on your local network, stored on computer or network hard drive.
Apps such as Heos by Denon, Sonos, MusicCast by Yamaha, Klipsch Stream and many others let you enjoy your music anywhere in the house.