Julian Casablancas favorite philosopher, whose work, Casablancas claims, held truth as an important standard value. He recognizes Paul Robeson as someone who used his musical platform to help further his serious political intrigue and as someone who, therefore, serves as a role model for politically engaged musicians. Casablancas has been a guest on the Russian sponsored program "Redacted Tonight", as well as included its host, Lee Camp, as an opener for a Voidz show in Houston, Texas in October 2018. Casablancas, along with the Strokes, provided vocals on a cover of Marvin Gaye's "Mercy Mercy Me (The Ecology)" with Joshua Homme on
Julian Casablancas award. In April 2015, it was revealed that Casablancas had worked on a song with Savages' Jehnny Beth. The collaboration was later announced to be a cover of "Boy/Girl", a 1983 duet by Danish punk band Sort Sol and Lydia Lunch. The music video, directed by Warren Fu, was released on December 4, 2015. The 7" was released through both Cult Records and Pop Noire Records on December 18, 2015. Casablancas also wrote the song "Youth Without Love" for Har Mar Superstar's 2016 album "Best Summer Ever", and is featured on "No One There", a song by Indian-born musician, Hammarsing