Objects of countless fantasies and rumors, the underground passages of the Paris Opera inspired a novel at the beginning of the 20th century, followed by the many works that stemmed from it, centered on its mysterious Phantom. A sulphurous magician, inventor, or composer of genius, the “Angel of Music” fascinates as much Hunchback of Notre-Dame, has made the mask concealing his deformity a symbol transcending the work itself.