Vocalists, (from left) Adele Addison, Eunice Alberts, James Pease, and David Lloyd rehearse with conductor Leonard Bernstein for the August 9, 1951 BSO performance of Beethoven's Missa Solemnis given in memory of Serge Koussevitzky in the Koussevitzky Music Shed at Tanglewood, ca. 1951.
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