The Pittsburgh Symphony Orchestra has announced its 2026-27 season. Here is a look at the two vocal performances. Manfred Honeck conducts Hindemith’s “Mathis der Maler,” Beethoven’s “Mass in C Major” and Arvo Pärt’s “Fratres.” Soloists include Jeanine De Bique, Julie Boulianne, John Matthew Myers, and Alexander Birch Elliot. The concert also features the Mendelssohn Choir of Pittsburgh. Performance Dates: Dec. {…}