Katy Perry declares on this empowering song that women can be complex with a multitude of personality traits.
A big beautiful brain with a pretty face, yeah A babydoll with a briefcase, yeah A hot little hurricane, ha! 'Cause I'm feminine and soft, but I'm still a boss, yeah
Perry said on Instagram: "Hey Hey Hey is one of my favourite songs from Witness and for me, it embodies the fighting spirit I always want you to be able to find within yourself, and to see in me."
Katy Perry wrote the song with Sia and Sarah Hudson. The latter is a singer-songwriter and a member of the pop group Ultraviolet Sound, who previously helped the Californian pop star out with "Dark Horse."
The track was produced by hitmaking noisemaker Max Martin and his fellow Swede Ali Payami. Sia, Martin and Payami all contributed to Witness' lead single "Chained to the Rhythm."
The whispered backing vocals at the end are courtesy of Norwegian singer-songwriter Astrid S, who has also featured on songs by Avicii ("Waiting for Love") and Shawn Mendes ("Air").
John Lennon wrote "The Continuing Story of Bungalow Bill" about Richard Cooke, a hunter he met at the Maharishi's camp in India. Cooke hasn't shot anything since the camp, except with his camera - he became a freelance photographer for National Geographic.