A free app for Android, by Logit Ltd..
The AirPlay Multiroom by WHAALE app is a music player that allows you to stream music to multiple AirPlay-compatible devices (i.e., multiple speakers or a home theater) at the same time.
This is possible because the app has a built-in server that can serve multiple music streams to multiple devices.
The app supports all AirPlay-compatible devices that have a Wi-Fi or wireless connection.
It works with the latest version of Android and requires a Wi-Fi or wireless connection to work.
The app does not require root access and is not limited by the number of devices or the number of streams.