Imagine for a moment the laser beam dancing around a football field without sound, while it looks great the experience can be made far better by adding music. The show designer can synchronise every movement of the laser beam, graphic or logo to coincide perfectly with every beat or change of the music. This can only be done with pre-recorded music. For live music the show designer acts as the ears of the computer and manually cues the laser show to coincide perfectly with every beat or change of the music. While this method works, you cannot beat the quality of a pre-recorded and designed show where the show designer can play over and over the show until the timing is perfect.