How grouping works with Sonos.
“This applies to grouping Sonos with other Sonos devices within the Sonos app and is the only supported way to do multiroom playback.”
This article shows how to play music from multiple Amazon Echo devices:
How to set up multiroom music playback with Amazon Echo:
To set up multiroom audio, open the Alexa app and select “Devices” from the bottom right corner. Tap the + icon in the top right, and select “Set Up Multi-Room Music.” The app will then prompt you to create a group, making it easier to control music playback by saying things like “Alexa, play music upstairs” instead of calling out individual speakers. Once you’ve created your group(s), add your desired devices, and the setup is complete.
