It's also possible those green tents have helium in them and a jet pack under them and they are all getting ready to float off to the the land of Oz or is it Never Never land they are going to this time......Posted by 42 (here)
of course... while it's quite possible that this is "Proof the powers-that-be are controlling criminal psychopaths" it is equally possible that these are musicians practicing harmony, deliberately isolated from the other musicians in order to maintain focus on their own melodic line. Just saying... cos i'm a musician who has used the same isolation technique.