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. The duo won Masked Singer Sverige in 2022, and participated in Melodifestivalen in 2023 and 2024. They won the latter edition, and will represent host nation Sweden in the Eurovision Song Contest 2024 in Malmö with the song "Unforgettable".
In 2012, Marcus and Martinus were contestants on the eleventh season of Melodi Grand Prix Junior. It was held at the Oslo Spektrum in Oslo, Norway, and was broadcast live by NRK, hosted by Margrethe Røed and Tooji. They won the contest with the song "To dråper vann" (English: "Two Drops of Water"). The song peaked at number eight on the Norwegian Singles Chart.