Many K-Pop fans was impressed with the girls’ vocals. The girls also sang Ailee’s “U&I” without the girls knowing that Ailee is one of the judges for the show, which caused the girls to be surprised and tear up when they approached the stage.Ailee also complimented the sisters saying, “It really moved me, by far the most amazing rendition I’ve ever heard” about the sisters’ cover of “U&I” Park JiYoon also teared up when one of the sisters, Almira sang “Listen” by BeyonceBy far, which singers did you like best that auditioned for Superstar K6? Watch drama online for free.