"Uptown Funk" is a song by British record producer Mark Ronson from his fourth studio album, Uptown Special (2015), featuring American singer and songwriter Bruno Mars. It was released as the album's lead single on 10 November 2014 via download in several countries. "Uptown Funk" was written by Ronson, Mars, Philip Lawrence and Jeff Bhasker. Produced by Ronson, Mars, and Bhasker, its composition began during a freestyle studio session when they worked on a jam Mars and his band played on tour. Copyright controversies arose after the song's release resulting in multiple lawsuits and amendments to its songwriting credits.