(LENOX, Mass.) – Music director Andris Nelsons will lead the Boston Symphony Orchestra in its traditional season-ending performance of Beethoven’s Symphony No. 9 at Tanglewood on Sunday, August 28, at 2:30 p.m. The performance features the BSO, Tanglewood Festival Chorus, and vocal soloists including soprano Rachel Willis-Sørensen, mezzo-soprano Ruxandra Donose, tenor Joseph Kaiser, and bass…