They are doing some voice instructions about yoga or relaxation or something. Then they will purchase music for background. It's up to me how they are will store the music and what format. I guess it should be easy enough for the owner to edit.

I thought it was a simple thing at first but it's ironic that it's going to require such complexity. I can deal with the complexity but I'm looking for the most elegant solution without breaking the bank.

Maybe I should just stick with a Sonos speaker and a few playlists they can just skip through with a custom simplified interface.