The BT River of Music on July 21 and 22 has Wynton Marsalis, Hugh Masekela, Staf Benda Bilili, Angelique  Kidjo, Ludovico Einaudi… It will take place on six stages over the two days before the opening of the Olympics. The venues include Trafalgar Square and the Tower of London. It is a major project produced by Serious in collaboration with the British Council and the Cultural Olympiad. Admission is “free” but all the events will be ticketed and there will be a £3 admin fee. Booking  upens next Tuesday . BTRiverofMusic.com