The fourth and final season of the American science fiction dystopian television series Westworld premiered on HBO on June 26, 2022, and concluded on August 14, 2022, consisting of eight episodes. In November 2022, HBO announced it had canceled the series.

"Perfect Day" is a song written by American musician Lou Reed in 1972. It was originally featured on Transformer, Reed's second post-Velvet Underground solo album, and as B-side of his major hit, "Walk on the Wild Side". Its fame was given a boost in the 1990s when it was featured in the 1996 film Trainspotting and after a star-studded version was released as a BBC charity single in 1997, reaching number one in the United Kingdom, Ireland, and Norway. Reed re-recorded the song for his 2003 album The Raven.