The 56-year-old, known as the “queen of power ballads”, has been having therapy to “rebuild” her voice, she told the BBC in June. On Friday, her delivery of Edith Piaf’s classic L’Hymne à l’Amour gave encouraging signs that the treatment is working. She was accompanied by a pianist on the first level of the Eiffel Tower, beneath giant illuminated Olympic rings. Canadian Prime Minister Justin Trudeau said that she “is a Canadian icon, an incredible talent, and she overcame a lot to be there tonight”. He added: “Celine, it’s great to see you singing again.”