Uptown Funk

Wikipedia lists Ronson, Mars, Bhasker and Philip Lawrence as writers, with Trinidad James and Devon Gallaspy added for the hook of "All Gold Everything" and the Gap Band's Wilson family and others added from May 2015 for "Oops Up Side Your Head". Bhasker, Mars and Ronson produced it. It began as a jam during soundchecks of Mars's Moonshine Jungle Tour, then a freestyle session with Ronson and Bhasker, and took about seven months; Ronson's guitar part was settled in Toronto after 82 takes, over 100 takes in all. Lawrence's sung bassline was kept in the final. The accounts of who played what in the first jam differ, NPR's summary having Mars on drums, Bhasker on synths and Ronson on bass, VH1's Ronson on guitar and Bhasker on keys. Ronson named Jimmy Jam and Terry Lewis, Rick James and James Brown as influences. Horns were recorded at Daptone in Brooklyn; Serban Ghenea and John Hanes mixed it at MixStar and Tom Coyne mastered it at Sterling Sound. It is in D Dorian at 115 beats per minute, 4:30 on the album and 3:55 on the radio edit.

It was released on November 10, 2014, entered the Hot 100 at 65 and reached number one in its seventh week, staying 14 weeks, and is 11x platinum from the RIAA. In the UK it spent seven weeks at number one and was the best-selling song of 2015. Cameron Duddy and Mars directed the video, shot on the 20th Century Fox New York Street backlot; it won an MTV Video Music Award, and has over 5 billion YouTube views. They performed it on Saturday Night Live on November 22, 2014, and in the Super Bowl 50 halftime show on February 7, 2016. It won the Grammys for Record of the Year and Best Pop Duo/Group Performance in 2016, and Setlist.fm has it as Ronson's second most-played song, 31 times. Fleur East covered it on The X Factor in 2014. Our upload is titled with the album, so it is presumably the album recording; we could not verify more.