I went to see the very first Laserium at Griffith Observatory in LA when I was 17 (almost 40 years ago.)
They started the show with Dark Side Of The Moon in a pitch black planetarium. With the pulsing heart beat intro barely visible at first they had red laser pulses beating in time.
When they launched into the song, 'Breathe', the immense dome of the planetarium was lit up in an instant with the utterly amazing sight of thousands and thousands of stars, forming the night sky over Los Angeles.
You could hear hundreds of people gasp as one, then let the air out of their lungs in one huge exclamation of wonder as they brought up the unobscured night sky of LA that no one had seen since the advent of street lights and smog, sixty to seventy years earlier.
It was the closest thing to a religious experience this side of a big handful of mushrooms or peyote buttons that I've ever had.
Interesting read here about the founder of the Laserium at Griffith Observatory
http://en.wikipedia.org/wiki/Ivan_Dryer