Order of events in the car park:

• band carrying instruments into car park
• stumbles upon guard, who thinks nothing of it
• goes onto the roof, sets up instruments, starts playing
• guard on duty starts to hear noise, follows sound
• finds amp lead, follows it
• finds band playing on roof, playing it to the world
• Goes to small band member orders him to stop, big band member then intimidates guard and tells him to go away
• retreats, calls in backup with walkies talkie 
• sees colleges doing clean habits e.g doing tie up, drinking cup of tea, looking at the cctv casually
• they go up to roof
• start listening to music, 'let their hair down'  
• Each band member is individually dragged away - guitarist dragged while still playing and pianist too, and are taken away. We don't see where
• Drummer is taken away, and his drum sticks maybe broken in front of him?
• Singer is left alone, still singing, then dragged away and thrown off the roof of the car park.