Back in April, I was playing a round at Poolesville and had bunkered my tee shot on the par-3 8th hole. As I was preparing to play, a group pulled their carts up to the nearby 10th green. One of the carts was playing music loud enough for everyone in their group to hear, as well as my group and anyone within a couple hundred yards. At first I thought some house nearby was having a party, but then I watched this group play out on the 10th and drive off to the 11th tee and it was clear the source was them. The quality of this sound wasn’t off some phone, it was a powerful and came from a good set of speakers.
Fast forward to my Myrtle Beach trip in June. I’m playing an afternoon round at The Legends – Parkland with my friend and we catch up to a twosome of young guys on the 9th tee. They were blaring Lynyrd Skynyrd from their cart. While they were kind enough to ask us to join them for their final hole, they made no effort to turn the music off while any of us was hitting.
This morning I was out cleaning the patio in preparation for my July 4th barbecue. My house backs to the 3rd tee at Lakewood Country Club, and a foursome pulls up in two carts with music blaring. They all play their shots and speed off as if nothing happened.
When I’m out back working with power tools and a group comes through, typically I’ll power down as a courtesy until after they’ve hit, and sometimes I’m thanked. When you attend any professional sporting event, music is usually played during stoppages in play but when the action resumes, it’s discontinued. Music is hardly ever an issue at a professional golf tournament (with the exception of The Phoenix Open), and even there, the drunks keep the noise level on the 16th to a dull roar when players are hitting.
I love loud music. I’ll turn up my electric guitar when nobody is home and rattle the windows; rock and roll was made to be played loud. But on the golf course? Is this the new normal? 
Rory McIlroy is now sponsored by Bose and typically warms up with his music, but uses headphones. Where is the decorum out there? Have you noticed this as well?
All About Golf 