Albarn wanted to write a song about how the parakeets (wild parrots) of London sound like space invaders. This is the result. He explained to The Sun: "You're unaware at first but then you look up and there's a flash of color and this alien sound."
"The Night Chicago Died" was written and recorded by the British group Paper Lace. They talk about Al Capone in the song, but got a lot of details wrong - understandable since they wrote it based on gangster movies.
Angus Young created the distinctive opening guitar part for "Thuderstruck" by playing with all the strings taped up, except the B. He learned the studio trick from his older brother George Young, who was the rhythm guitarist for The Easybeats.