Marcus & Martinus, occasionally known as M&M, are a Norwegian dance-pop duo consisting of identical twin brothers Marcus and Martinus Gunnarsen (born 21 February 2002 in Elverum, Norway). They have released three albums: Hei, Together and Moments. Since winning Melodi Grand Prix Junior in 2012, they have won numerous prizes, such as Spellemannprisen in 2017.

Source: Wikipedia (https://en.wikipedia.org/wiki/Marcus_%26_Martinus)