"The Key to Life on Earth" is a song by English singer, songwriter, and musician Declan McKenna.

[1] The song was written by Declan McKenna, Max Marlow and produced by Jay Joyce.

Talking about the song, McKenna said, "'The Key to Life on Earth' reflects on mundanity and hostility.

Talking about the video, McKenna said, "Alex Lawther is someone I've wanted to work with for a long time, I enjoyed watching his roles in Carnage, Black Mirror and The End of the F***ing World, and I was trying to get in contact after seeing how much people compared us online.

"[2] In an interview with NME, Lawther called McKenna a 'wonderful musician' and that he often gets mistaken for him in public, "Sometimes people come up to me and say: 'I loved your concert last night you were so great'.