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 live solo debut for a private party for fashion brand Opening Ceremony in Tokyo, Japan. To celebrate the release of the EP, Casablancas performed a series of shows in October 2009 at The Downtown Palace Theatre in Los Angeles with his live show band, The Sick Six. Members of The Sick Six include Jeff Kite (keyboard), Nelson London (synthesizer), JP Bowersock (guitar), Danielle Haim (percussion) and Alex Carapetis (drums). Casablancas then toured with The Sick Six in Europe, United States, Australia and Japan from November 2009 until July 2010. Casablancas composed an original song, "I Like The Night", as part