Ring back tones are terrible.
Absolutely horrible. It's always the last song you would want to hear while waiting to talk to someone that you don't really want to talk to who, in turn, doesn't really want to re-live their car accident over the phone with you.
The only thing worse is............
People who have their small child record their voicemail greeting.
Your little kid is screaming something inaudible into the phone and now I'm not leaving a message. You are the only one that thinks your kid is cute. Yep. It's true. Your husband? Nope. Just you.
I highly doubt you are calling yourself and leaving messages very often so just stop it.