NEW : Young athletes light the Olympic cauldron after the queen opens the games . Spain suffers shock defeat to Japan . Performances pay tribute to British history , literature and music . The Greek chorus leads the parade of athletes into the stadium . Organizers had sought beforehand to keep the event 's details secret .
NEW : Young athletes light the Olympic cauldron after the queen opens the games . Performances pay tribute to British history , literature and music . The Greek chorus leads the parade of athletes into the stadium . Organizers had sought beforehand to keep the event 's details secret .