If you have a chance to see the Trans-Siberian Orchestra, I highly recommend seeing the show. I saw them back in 2003, and just got back from their show today.
It's hard to put into words the stage show they do. Lots of lights, lasers, and pyrotechnics. A lot more then I remember in the 2003 show.
If you like the music they play, there is no way that you would be disappointed in seeing the show.