How Songs Were Made on Instagram: "The pig first appeared in 1976 during the photoshoot for their album Animals. The band had a massive helium-filled pig balloon tethered above Battersea Power Station in London for the cover art. On the second day of shooting, the pig broke free and drifted into the sky, causing chaos—it even interfered with air traffic and forced Heathrow Airport to delay flights until it was found in a farmer’s field in Kent. Since then, the flying pig has become one of Pink F