Multi room music - question

[Maniac]

So I’ve no issues getting all my echos to play the same music on my ‘everywhere’ group using the likes of ‘Alexa play on my mind by the disciples everywhere’. But if music is already playing, say in the lounge and I want to expand this to the everywhere group as I’ll be moving around the house, I can’t find any command that works, such as ‘Alexa play everywhere’ or ‘play music everywhere’ without it either starting some random music or telling me to enable it in the app (which I already have).

Any thoughts?  Thanks.