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 Schaffer of The Lonely Island for their 2009 debut album "Incredibad", and was featured in an SNL Digital Short for the same song. In addition, he also recorded "I Wish It Was Christmas Today", a festive song based on a "Saturday Night Live" skit made popular by Jimmy Fallon, Horatio Sanz, Chris Kattan and Tracy Morgan. Casablancas performed the song live on "Late Night with Jimmy Fallon" on December 21, 2009, together with The Roots, Horatio Sanz and Jimmy Fallon. He also appeared in the 100th Digital Short, which aired on May 12, 2012. Casablancas also collaborated with Danger Mouse