I saw this on the SonicState website this morning and thought it was interesting. Apparently, somebody went around the SuperBooth show recording bits of Tubular Bells on various synths that were on display, then put it all together to makes this video. An interesting idea. Although, it doesn't sound like the audio was recorded at the show. I suspect that he might have just shot the video there, then synced up all the clips with an audio track he created at home using softsynths and other gear. But that's just my suspicion. I don't actually know how he did it.
https://www.youtube.com/watch?v=Zi2l-B7OQ3A