(Credit: Martin Sigmund) While the midsize southwestern German city of Stuttgart is not an international operatic centre like Berlin or Munich, it’s nonetheless important to opera’s history. It witnessed the world premieres of three major works: Strauss’s “Ariadne auf Naxos“ (1912); Zemlinsky’s “A Florentine Tragedy” (1917); and Philip Glass’s “Akhnaten” (1984), in addition to several operas by Carl Orff and {…}