EXO is a 12 member rookie boy group signed to SM Entertainment. The group is cut in half into two groups with one group promoting in Korea (EXO–K) and the other promoting in China (EXO–M). Over a span of three months SM released over twenty teasers vids and released two “prologue“ songs to showcase the boys singing and dancing abilities. In April 2012, the boys finally debuted with their single “MAMA” and released their first mini-album with the same name. Though the boys have just debuted, both groups have been in the top 10 in several KPOP/CPOP charts.