The only thing you need to configure is the user and password to connect with you messic music server (installed at your home also, anywhere in your own network). After that you can move easily through the entire music database that you are managing. The music willl continue playing wile you are watching TV of whatever in background. You can stop it whenever you want.
Please, remember that messic and all of the official clients (like messic for smartphones and this app) is an open source project, completely free. It is a GPL3 product. Help us to improve it!