Lead guitarist Angus Young wrote the lyrics. Johnson got a shiver when he recorded his song, thinking of the band's late co-founder and rhythm guitarist, Malcolm Young. Angus' brother died from the effects of dementia aged 64 on November 18, 2017. Johnson told The Independent
he still sees Malcolm in his mind every time he hears this song being played.
"Whenever I hear it, I still get goose bumps," he said. "I still think of him. I was thinking of him when I sang it. It’s just these things about the happy days when we first started in the '80s, when I first joined the band. I just remember these very happy, carefree days. And Angus did a magnificent job of putting those lyrics together. I think he really felt it, too, because him and Malcolm were inseparable."