(Photo: BrettBoardman) Undoubtedly, Sydney is coming of age as a culturally vibrant city, with thought-provoking, often superior productions of concerts, musicals, plays and operas. This long-awaited but most welcomed process is well illustrated by two excellent opera performances within less than a week that would be hailed anywhere in the world: a few days after Richard Wagner’s “Die Walküre” had {…}