dj stage lighting

How can a good graphic presentation synchrinized on a backdrop on stage?

I was at a small show in a club where the artist had a visual presentation on his background. The graphics and lights projected on the backdrop reacted to the beat of music. There was a light standard DJ going all over the place, but it was an isolated projection designs that were n sync with the music. I am looking for only one piece of equipment or software design is involved in having this? Please help. Is a projection, but when the music stopped the music stopped the digital transition stopped too.

In many ways ... may have been a projector playing a video that had already in sync with her music ...

My New Light the American DJ Sunray Tri LED