Lady Gaga Halftime Drone Swarm Was Pretaped to Shield Crowd
https://www.bloomberg.com/news/articles/2017-02-07/lady-gaga-s-halftime-drone-swarm-was-pretaped-to-shield-crowd
The synchronized swarm of 300 drones lit up the night sky behind Lady Gaga, morphing into an American flag as she recited the Pledge of Allegiance.