MusicCast is a prorietary multi-room audio system built into many Yamaha products, including AV receivers, sound bars, wireless speakers and a turntable.

Designed to work with your Wi-Fi® router, MusicCast lets you stream all of your music and other audio content to every room in your home with easy control from the MusicCast app, an Alexa device or third-party control system, such as Control4, Crestron, ELAN, RTI, or URC.


Source: Yamaha