“Joker: Folie à Deux” picks up with Arthur Fleck ( Joaquin Phoenix ), institutionalized at Arkham Asylum, awaiting trial for his violent crimes. As he grapples with his fractured identity, Arthur finds love with fellow inmate Lee (Gaga) and begins embracing the music that has always played inside his chaotic mind.

"Well, I know what I'm going to be showing him later. That's so cool, thanks for showing me that," the singer said.

In developing the ‘Joker’ sequel, director Todd Phillips said the team “just found ourselves writing more and more music into it”