Heo Jun is a South Korean musician and member of YB (formerly known as Yoon Do Hyun Band, 윤도현밴드). Yoon Do Hyun had debuted as a soloist in 1994 and he decided to form a band a few years later. He joined in 2000 as the band's new guitarist and keyboardist with their studio album, "Singing Korean Rock Again" (한국 Rock 다시 부르기). They nearly disbanded just months before he joined after an initial lack of success but they experienced a surge in popularity after composing the cheer song for the 2002 FIFA World Cup. They became the first band to perform in North Korea in 2002, the first South Korean band to perform at the "South by Southwest" (SXSW) festival in Austin, Texas in 2007, and to tour Europe in 2008.

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