Prerecorded audio or video was taped before being broadcast later. Olympic figure skating programs are performed to prerecorded music.
In contrast to a live performance, like a play or a concert, prerecorded shows were taped earlier. Most TV programs are prerecorded, with the exception of some sports broadcasts, awards shows, and special live episodes. On the other hand, you expect to hear live music at a concert — it would be disappointing to watch your favorite band mouthing the words to prerecorded songs! The prefix pre- means "before," and recorded has a Latin root meaning "repeat or remember."