Artists by Digital and Radio FactsSeptember 21, 2017April 7, 20260 ADVANCED CLIPS FOR ‘OPRAH’S MASTER CLASS’AIRING SATURDAY, SEPTEMBER 23Featuring Usher at 9 p.m. ET/PT and Gladys Knight at 10 p.m. ET/PTPhotos Courtesy of the Oprah Winfrey Network Also Read: Why Sam Cooke’s Death Will Never Be Solved (Guest Editorial)