015B

015B is a South Korean music duo that debuted in 1990 and went on to become one of the country's most popular acts of the early 1990s. The group name which means literally "A crow flies across the sky" and it consists of brothers Jeong Seok-won and Jang Ho-il, is known for its "guest singer system," and has never had a permanent lead vocalist. The group has experimented with many music genres including pop ballads, electronica, and hip hop.