South Korean-Chinese boy band Exo consists of three studio albums, four extended plays, and eleven singles. Exo was formed by the Korean entertainment company S.M. Entertainment in 2011, and formerly consisted of twelve members separated into two sub-groups, Exo-K and Exo-M, releasing the same music simultaneously in both Korean and Mandarin in South Korea and China, respectively. The group's first release, the extended play Mama, was released in April 2012.