This week, Debussy’s masterwork “Pelléas et Mélisande” returns to the Metropolitan Opera stage for the first time since 2011. The opera will feature Paul Appleby and Isabel Leonard in the title roles respectively. Appleby will be the 15th Pelléas in Met history while Leonard will be the 17th singer to inhabit the role of his doomed lover Mélisande. Here is {…}