How Lady Gaga Imagined Harley Quinn as a Theater Kid for ‘Joker: Folie à Deux’: She ‘Created This Backstory’ About Lee Being ‘Really Into Musical Theater’ – imdb

Original Joker: Folie à Deux endings had Lady Gaga’s Lee going full Harley Quinn  Flickering Mythsource

Lady Gaga’s same-sex kiss in ‘Joker 2’ was cut — here’s why  New York Post source

I Finally Understand Why Lady Gaga Said Joker 2 Wasn’t Really A Musical  Screen Rantsource

Warner Bros. Exec Partly Blames Lady Gaga’s Harley Quinn Casting for Joker: Folie à Deux Failure  MovieWebsource

‘Joker: Folie à Deux’s Ending Was a Direct Result of Christopher Nolan  Collidersource

Lady Gaga ‘disappointed’ by fierce criticism over ‘Joker: Folie à Deux’  Yahoo New Zealand Newssource