(Credit: Fay Fox) The National Symphony Orcehstra has announced its 2020-21 season. For this article, we will highlight the vocal performances. The season opens with Gianandrea Noseda conducting Isabel Leonard in a program that includes Ravel’s Boléro, arias from “Carmen,” Ginastera’s Four Dances from Estancia, and Rimsky-Korsakov’s Capriccio espagnol. Performance Dates: Sept. 26, 2020 Gianandrea Noseda conducts Beethoven’s Missa Solemnis {…}