The Tanglewood Music Shed, a large fan‐shaped hall seating 6000 people indoors (approximately 6000 more can be accommodated outdoors on the lawn) was modified in 1959 to improve the acoustics. The acoustical qualities that were to be improved included sectional balance for large orchestra, balance between orchestra and soloist, clarity of music inside the hall, and loudness of music on the lawn. The architectural solution was the design of an orchestra enclosure and a canopy over the orchestra and the front part of the audience. Also, a 14‐ft high chamber music orchestra enclosure was installed in 1960. This paper discusses the details of the construction and presents comments by musicians and listeners following its completion.