What do you use to listen to music while swimming?
I use a ipod shuffle which has been waterproofed aftermarket. There are several companies doing this, but the thing that made the difference to me was the earphones, which also have to be waterproof. I went with AudioFlood since they have a short cord, and they turned out to be super comfortable.
Sadly, the earphones died about two years in, and after an email to AudioFlood about a replacement, I was told that I could get new ones for 50%, so $20 instead of $40. However, I had to do it via a phone call to AudioFlood. I must have called them 40 times over the last couple of months, but no one ever answers the phone, and they do not return phone messages.
So, I have tried two other brands of waterproof earphones, but not with the same happiness level.
But, I love the shuffle! :)