In a statement to triple j, Tkay explains the song was originally intended for last year's self-titled debut album:
"Girls reached out to my US label asking if we had any unreleased songs for their final ever season as Lena knew who I was and is apparently a fan of mine. They wanted something for a party scene and I have maybe 5-10 songs that are basically finished but didn't make the cut for my album.
"We thought Glorious could fit well so sent them that and the feedback was that Lena loved it and they wanted to use it. I love the show and it's really crazy that they know me but I'm excited to see the track in there and for people to hear it."