Céline Dion sparks mass karaoke and power-ballad fever with return to stage in Paris

Fans from around the world gather for star’s long-awaited performances after break because of neurological conditionMore than 30,000 Céline Dion fans have gathered in Paris for the Canadian singer’s long-awaited return to performing on Saturday night, four years after she revealed her diagnosis of stiff person syndrome, a rare neurological condition.Thousands more people without tickets have flocked to a series…