The form of variation with time of a wave whereby information, message, or effect is conveyed in communication.
"Thanks so much for the beautiful job you did on my LPs! The Vivaldi IS breathtaking! I really think it's better than the original. All the LPs I've sent you are family favourites, 20-30 years old, that we haven't been able to play for about 12 years, and you can't imagine how wonderful it is to be able to hear them again. I don't have any more ..."