LONDON, May 29: Singers Beyonce and Madonna, activist Gloria Steinem and Bishop Desmond Tutu will be among big names reaching out to a billion people from a pop concert in London on Saturday with a message of empowerment for women across the planet. The “Sound of Change Live” gig headlined by Beyonce, Florence + the Machine and Jennifer Lopez will be broadcast live from Twickenham sports stadium to 150 countries, and on primetime TV in the United States the following day, organizers said on Tuesday. (agencies)