The father of the laser harp is the french musician and componist Jean-Michel Jarre he let Denis Carnus build one in 1980 and played it in concerts. I've seen it twice live, at that time it was completely incredible (and quite dangerous). Today it's still very impressive.
Some people said it was a fake instrument, I can insure it wasn't, it was linked to an old synthesiser to generate the sound and control the envelope. You can hear it in JM Jarre "Rendez Vous".
That Pipe Dreams animation has been one of my favorites for a long time. I think the Intel trade show booth was very clever, but I don't believe it was producing the music that accompanied it. ....and then there were all the marbles on the floor afterward.