From the home app, single tapping an Apple TV plays\pauses music depending on what you were last doing. Example, the last thing I did in the den was listen to music. Single tapping that Apple TV woke it up, turned on the TV, and started playing music from my library. My daughter was last watching Netflix in the bedroom. Single tapping that one did nothing until I rebooted it. Once rebooted both Apple TVs now act the same way. It’s buggy at best but in beta 1 I’m fairly certain that single tapping did nothing.