I haven't been spoiled by music while riding, but when we used to find a beach and anchor, I had a desire to get sound to the beach. Boat speaks don't do so hot for that. I thought it would be nice to mount some Bose, etc., box speakers inside the trunk lid so that you could opne the trunk and they'd be pointing aft towards the beach.
We stopped beaching like that for the most part so the thought got filed away.