Do you listen to music while you work, especially flatwork - long hours. These cheap headphones are the best I've tried, they go right under ear muffs.
Heck, they're everywhere, try amazon you can probably find them around $10 I usually buy three. With ear protection on and these in your ears you'll hear stuff in songs you miss when you're not around equipment.
Even though I am completely guilty of agreeing with you Mark about listening to the equipment, I actually wear a pair of noise canceling head phones, they are great they drown out all noise around you and just hear tunes, I listen to the satellite radio and drift off into work.
I listen to music on some jobs that are easy. But theres jobs that i have to be on my toes. I used to listen to Howard stern on sirus but i no longer have the set up to listen to it on my headphones. that guys show is a trip