The form of variation with time of a wave whereby information, message, or effect is conveyed in communication.
"Dear LP2CD.com, Hi, I just wanted to let you know that I received the CDs in the mail on Friday along with my original records! THANK YOU for the fantastic job again! Hearing this music again on CD just brought tears to my eyes ;)! I never thought I would be able to enjoy then again! I plan on sending you more stuff to transfer to CD soon as ..."