claim: Backing vocalists provide vocal harmony.
evidence: Kwang-jo , also spelled Kwang-cho , is a Korean male given name .. People with this name include  :. Kwang Jo Choi -LRB- born 1942 -RRB- , South Korean taekwondo national champion. Kwang Jo Choi. Kwang Jo Choi. Jo Gwang-jo -LRB- 1482 -- 1519 -RRB- , Joseon Dynasty neo-Confucian reformer. Jo Gwang-jo. Jo Gwang-jo. Yoon Kwang-cho -LRB- born 1946 -RRB- , South Korean ceramic artist. Yoon Kwang-cho. Yoon Kwang-cho