Sonos Multi-Room Music System User Manual page 55

Chapter 3: Managing Zones
If you want to join all the zones in your house to this music queue, select All
Zones-Party Mode
synchrony until you drop the zones from the zone group.
Select zone where desired music is playing
Using the Sonos Controller for iPhone/iPod touch
Tap the Zones button
1.
Tap the Zone Group
2.
(add more rooms to.)
All of your ZonePlayers will then play the same music in
.
.
button to the right of the zone you want to group
Select zone to add to group
3-3