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Beyonce, Usher and Rod Stewart are set to perform at Fashion Rocks, a style-conscious megaconcert taking place on Sept. 8 at New York's Radio City Music Hall. Andre 3000, Mary J. Blige, Alicia Keys and Avril Lavigne are also on the roster. Fox will broadcast the all-star jam as a two-hour special on Sept. 26. In addition, a magazine supplement on the relationship between hot tunes and haute couture will be included in subscription copies of the October issue of 12 periodicals, among them W and Vogue.