The Atlanta Symphony has announced its 2020-21 season. For this article we will highlight the vocal performances. Mendelssohn’s “Elijah” will be conducted by Robert Spano with soloists Jessica Rivera, Kelley O’Connor, Thomas Cooley, and Nmon Ford. Performance Dates: Nov. 19 & 21, 2020 Handel’s Messiah will be conducted by Norman Mackenzie and the ASO Chamber Chorus. Performance Dates: Dec. 17 & {…}