"Uptown Funk" is a song by British record producer Mark Ronson featuring American singer and songwriter Bruno Mars, from Ronson's fourth studio album, Uptown Special (2015). The song was released as the album's lead single on 10 November 2014 via digital download in several countries. "Uptown Funk" was written by Ronson, Mars, Philip Lawrence and Jeff Bhasker. Since the track interpolates "All Gold Everything" (2012), songwriting credits were added for a total of six. Produced by Ronson, Mars, and Bhasker, its composition began during a freestyle studio session between the former three by deciding to work on the jam that Mars and his band would play on tour. The song went through several incarnations, worked on for months during stressful sessions, recorded at multiple locations, and at one point it was nearly scrapped. Copyright controversies arose after the song's release, with multiple lawsuits and amendments to its songwriting credits, due to similarities with "Oops Up Side Your Head" (1979) by The Gap Band, keyboardist Rudolph Taylor, and producer Lonnie Simmons.