Madame Monsieur is a French duo consisting of vocalist Émilie Satt and producer Jean-Karl Lucas. Émilie Satt, born Émilie Sattonet, and Jean-Karl Lucas first met in 2008, and formed Madame Monsieur in 2013. In 2015, they composed the song "Smile" for the French rapper Youssoupha, and later participated in Taratata. The duo released their debut album Tandem on 4 November 2016. On 1 January 2018, they were confirmed to be taking part in Destination Eurovision 2018, the French national selection for the Eurovision Song Contest 2018 with the song "Mercy". They qualified from the second semi-final on 20 January to .