The Tanglewood Festival has announced its 2026 season. Here is a look at the vocal performances. The  Boston Symphony Orchestra and Andris Nelsons lead a Mozart and Mahler program with soloists pianist Emanuel Ax and soprano Erin Morley. Performance Date: July 11, 2026 Les Arts Florissants and William Christie will perform Charpentier’s “Les Arts florissants and La Descente d’Orphée aux {…}