@SweataVest4Real said:

I'm surprised that there hasn't been more description of what exactly went down during this 'Drive-In' set. Where was the band in relation to the screen? Were they playing to the video in any sense?

Is this not the sequence that was playing on the screen?

The band was directly behind the screen, right in the in the center (maybe a little towards stage left if any). Check out the video at about the 24 min mark; there's a good shot of the band that you can see through the screen. Occasionally the live feed video (I-Mag) of the band would show up on the main screen, but would be highly altered artistically to blend in with the other images- you couldn't necessarily make anything more than the outlines of the band member/instrument. I felt, if anything, the video was changing in reaction to the music (similar to the visualizer feature in iTunes).