[Maritime Q-Scout]

Here's a question I only started to try to figure out but is proving more difficult than I think it should be.

I'm listening to an audio book on my iPhone. It's been great for the copious amounts of shovelling I've had to do over this winter. However is like to play t in the house while cleaning, working out, etc.

The stereo system in the living room would be perfect for this. If love to be able to chromecast the audiobook, including where I left off etc.

I can stream video but haven't found how to stream just the audio.

Anyone have a fix for this? I'm sure it's something very simple and stupid that I'm missing.