On February 20, the curtain of the Salle Garnier at the Opéra de Monte-Carlo rose to inaugurate Jean-Louis Grinda’s new staging of Massenet’s “Werther,” co-produced by the Palau de les Arts Reina Sofía in Valencia, where it received its initial performances in 2017. Just as any Wagnerian pilgrimage naturally leads to the Festspielhaus in Bayreuth, every fervent admirer of Massenet {…}