"Uptown Funk" is a song by British record producer Mark Ronson, featuring American singer and songwriter Bruno Mars. It was released on 10 November 2014, as the lead single from Ronson's fourth studio album, Uptown Special (2015). "Uptown Funk" was written by Ronson, Mars, Jeff Bhasker, and Philip Lawrence; it was produced by the first three writers mentioned. The song began to be written during a freestyle studio session while they worked on a jam Mars and his band had been playing on tour. Copyright controversies arose after the song's release resulting in multiple lawsuits and amendments to its songwriting credits.