There are several artists or groups with this name: 1. EXO (Korean: 엑소) is a Chinese-South Korean boy band based in Seoul. Formed by S.M. Entertainment in 2011, the group consists of twelve members separated into two subgroups, EXO-K and EXO-M, performing music in Korean and Mandarin, respectively. EXO rose to fame with the release of their best-selling first album XOXO (2013), which contained the breakthrough hit "으르렁 (Growl)". XOXO was a critical and commercial success