listening to Apple music on multiple devices at the same time

You cannot have your iPhone playing the same song that you Airplay to other speakers or use the Apple Music service from the speakers.

If you have the Family Plan of Apple Music, you can listen to songs on multiple devices at the same time. For example, one family member could be listening to their HomePod/Sonos speakers, while another family can be playing music on their device.

If you have a Mac you can send to your Apple TV and a separate Bluetooth speaker