Oprah Winfrey is kicking off her show's fall season with sit-down interviews with pop stars like Jay Z, Mariah Carey and Whitney Houston. Another talk show host, Ellen DeGeneres, will determine the fate of contestants on the next season of American Idol. Today, a look at how media celebrities outside the music world are shaping tastes of music fans. We're joined by Maura Johnston of the music blog Idolator.com and Robert Thompson, professor of television and popular culture at Syracuse University.