Alexa Smart Home Groups. These can be named kitchen lounge dining room bedroom etc. Go to the menu and select the devices icon.
Select the devices you want to include and then select save. To create a group you can control with alexa. Go to the menu and select the devices icon.
Then just ask alexa to play music on the group and the sounds are piped to all the devices in that.
Create smart home groups for alexa open the alexa app. Tap the menu button and select smart home select the groups tab tap add group and then select smart home group enter a name for your group or select an option from the list of common names select the lights you want to add to the group and then tap. Create smart home groups for alexa open the alexa app. Initially this makes most sense when talking about smart lights like those from philips hue and lifx.