In 1980s is when the ballads genre rising in Korea and 1990s is development of modern K-pop musicians incorporated partially Europop and mostly American popular music styles such as hip hop, rock, jazz and electronic dance in their music. And idols that were popular at that time are Seo Taiji and Boys, H.O.T. , Sechs Kies and many more. Then in 21st century is K-pop’s increasing popularity forms part of Hallyu, or the Korean Wave, which refers to the popularity of South Korean culture in other countries. K-pop is increasingly making appearences on Western charts as Billboard. The development of online social media has been a vital tool for the Korean music industry in reaching a wider audience.