South Korea's two largest entertainment companies, whose performers include Big Bang, Girls' Generation and Psy, have become members of the country's main lobby group for big businesses, an official press announcement said Tuesday. The Federation of Korean Industries (FKI) said the group's 21-member executive body approved the membership of SM Entertainment and YG Entertainment along with applications made by 52 other companies. The other companies are leaders in the country's service and tech venture sectors.