Which singer is also a guitarist, Kang Seung-yoon or Piotr Wiwczarek?
Piotr Wiwczarek Piotr Wiwczarek (born 22 October 1965 in Olsztyn, Poland), also known as Peter, (ex nickname Behemoth) is a Polish guitarist and vocalist who is the frontman for the death metal band Vader, as the only constant member of the band since its inception. He has also collaborated with Kazimierz "Para" Paraszczuk on his tribute album, Bandid Rockin', and is the producer of several of Vader's releases. He is also the founder and guitarist of a side-project, named Panzer X.
Lee Seung-chul Lee Seung-Cheol (; also spelled Lee Seung-Chul; born December 5, 1966 in Seoul) is a South Korean singer. He was the main vocalist of Boohwal, a South Korean rock band, until 1989 when he left the band and released his first solo album, "Don't Say Good-Bye" (안녕이라고 말하지마). In 2005 his 7th album, "The Livelong Day", won him Korean Music Awards for best male singer. He has been working as a judge in reality television series "Superstar K". On August 27, 2014, Lee performed "Arirang", "Bridge over Troubled Water" and "The Day" at the opening ceremony of the 65th Annual UN DPI/NGO Conference.