We also have a Sonos PLAY:1, which is the current music streaming workhorse.
With 4 Expresses, AirPlay is available everywhere - but it's usually only used for beaming video to the Apple TV.
Thanks to Sonos, our entire music library, SiriusXM and Spotify, are available from every device to the Sonos equipment.
With AirPlay hooked up to our whole home intercom, that music is also available for streaming to essentially every room in the house (and the patio).
At this point, we're going to build out the Sonos system.
Step one is adding a Sonos CONNECT to our primary home theater stereo.
One of the best attributes of the CONNECT is that we can run our turntable through its analog line-in, and stream vinyl to other Sonos devices.
UPDATE, 2023 - Our new home has a Sonance whole-home sound system installed, so we added a Sonos PORT, making it all HomeKit compatible.
There's a HomePod in the kitchen, which replaced the PLAY:1 and acts as our primary "Siri". Ask it to play a song "everywhere", and the Port sends it all over.
On the turntable, we have a Sonos FIVE, with its direct line-in.
Right next to it is a Sonos MOVE, which we can take outside.