I have echo flex’s throughout my house and I use voice scenes to play whatever I want wherever I want. I know it’s a little more tedious because you need to create all the scenes, but my family loves it. For example when I say, “Alexa, play billy Joel in the kitchen”. The Billy Joel Pandora station will play in the kitchen. It would be nice if it were possible to avoid saying the room you wanted to play the music in but that’s not really a big deal. This seems to be the best solution for what you’re looking for that I know of at least.