The Washington Concert Opera has announced its 2018-19 season, showcasing two rare gems. The season opens with Gounod’s “Sapho,” a work known for its famous aria “O ma lyre immortelle.” Kate Lindsey takes on the title role  with Addison Marlor rounding out the cast, Performance Date: Nov. 18, 2018 Lawrence Brownlee headlines Rossini’s’ “Zelmira,” a work that has been showcased {…}