I used to always mow my lawn with Peltors on. First without a radio, then with. Now I use in-the-ear headphones and my iPod or iPhone. I have always worked with music in the background, and I miss it, if it isn't there. My in-the-ears don't offer as much hearing protection, but they are significantly lighter, less obtrusive and cooler. Have you ever worn Peltors and hit an ear cup on something hard? Not pleasant IMHO.
I mostly work at a computer in a shop situation where others are working. When I can't drown out the noise with my iTunes on the computer, I still reach for my Peltors. I love the noise reduction, but my ears are truly claustrophobic, and I can't wear them for very long.
When I work in my own shop, I carry the stereo remote in my apron. When the Peltors go on, the stereo goes up.