 One of the judges was rock singer Yoon Do-hyun of the South Korean rock band YB.In 2011 they opened and performed alongside many artists including B.o.B, Far*East Movement, Black Eyed Peas, Justin Bieber, Jessie J, and Diana Ross.Blush has released seven singles, the two most popular (according to YouTube views) being "Miss Out" (441,000 views) and "Undivided" (425,000 views) as of May 2013.