I had one horse that had surgery for sand colic. The great guys at OSU removed a 90 pound impaction while listening to Metallica. My mom (who's an emergency department doctor) got a big kick out of watching the vet do the surgery to that particular music.
Gee, I just had I thought. I wonder if he was playing "Enter Sandman".
@ fltrailrider, I am very sorry for your loss. Whether it was best for the horse or not, it still hurts to lose them. Based on your post, I'm sure that you did what was right for your horse.