I always play music on the course. I walk and have an Ultimate Ears Roll 2 speaker strapped to my bag, usually bumping SiriusXM Rock the Bells. I don’t play music loud enough for the whole course to hear but if you are near me, you’ll hear my tunes.
I have a small bluetooth speaker and usually have music playing in the cart at a low volume. If I play with somebody outside my usual group, I either leave it off or ask if they mind the music playing. If they object to it, I won't turn it on.