I think it would be awesome. Though you know I have to say the preaching would have to be either carefully arranged to focus on universal beliefs - or else ... nah. I think best not to stir up disagreement.
I had a second there thinking about the music. I like many kinds of music, but I'm trying to learn Byzantine chant so I listen pretty much exclusively to that. It sort of disrupts my inner music to listen to other things (I listened to a parody of Bohemian Rhapsody the other day to discuss with a friend and it has played havoc getting it out of my head lol.)
But anyway, my thought THEN was how cool it would be if we could hear different examples of different kinds of music. That could be edifying for all.
So for a second my thoughts went to preaching. But no ... I think it would stir too many folks up (in a wrong way) to hear preaching distinctly opposed to what they believe.
So better I think to stay with what we all can agree is good, true, pure, edifying. And there is much, after all.
(Sorry for the convoluted glimpse into my thought process lol.)