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 and Sparklehorse on the song "Little Girl" on the 2010 album, "Dark Night of the Soul", contributing the lyrics, lead and backing vocals, and guitar solo. Aside from vocal collaborations, he also contributed to a song, "Forrest Gump", on Digitalism's sophomore album "I Love You, Dude" in 2011. The electronica duo initiated a collaboration with Casablancas through his manager, and Casablancas contributed 'a 30-second recording with him on guitar' via email. Casablancas also lent his vocals to the title track, "Rave On", on a 2011 tribute album to Buddy Holly, "Rave On Buddy Holly". In 2016, Casablancas contributed three specially