Editing video to music is easy to do.... it takes real talent thought to find the right video and match it to the right music.
As to this video... it is very easy to do what they did.
There is a lot of planning involved... but basically it was all editing. They just shot each light segment independantly then assembled them in the editing process to match the music.
Very easy to do. Just time consuming. A very nice video BTW.
(Case In Point)
12.8 Megs Video