“American Idol” contestant Schyler Dixon joined the Warren County High School choir for a memorable Christmas concert last week.A near-capacity crowd was on hand at the WCHS auditorium to get in the holiday spirit. The Christmas concert was a first for the choir since it reorganized last year.Dixon brought her star power to the stage and performed “All I Want for Christmas is You,” “Merry Christmas,” “Jingle Bell Rock” and “Santa Claus is Coming to Town.” She was accompanied by Will Rudder on guitar and Scott Gregory on keyboard.“I am so pleased with how everything turned out,” said WCHS choir director Kennette Dixon.