2NE1 is a South Korean girl group created by YG Entertainment. First appearing in a Cyon commercial campaign with Big Bang for LG Telecom, their debut single "Fire" was released on May 6, 2009.
In January 2009, it was announced that the "Female Big Bang" would debut around July 2009 with three members — CL, Minji, and Bom.
Later that month, YG stated that Sandara Park joined the group, with one more member to follow.
In the end, YG Entertainment announced that the group would consist of four members and debut sometime in May 2009. The company stated that the group had trained for 4 years, and that their debut album would contain songs produced by G-Dragon. The group's name was initially announced as "21"; however, due to the discovery of a singer with the same name, the group was quickly renamed "2NE1".