Tanglewood summer since, except for the interval 1942–45 when the Trustees canceled the concerts and summer school due to World War II. The Shed was renovated in 1959 with acoustic designs by BBN Technologies. In 1986 the BSO acquired the adjacent Highwood estate, increasing the property area by about 40%. Seiji Ozawa Hall (1994) was built on this newly expanded property. Leonard Bernstein conducted the Boston Symphony at Tanglewood in August 1990 in what proved to be his very last concert. Deutsche Grammophon released a live recording of the concert on CD. In addition to hosting world-renowned programs of classical, jazz,
Pittsburgh Symphony Orchestra with local audiences that around 1,200 people attended a concert he conducted at the Syria Mosque during one of Pittsburgh's worst snowstorms. He returned to Pittsburgh in 1949, 1950, and 1951 to perform with the symphony. The Pittsburgh Symphony Orchestra established a Guest Conductor Chair in his name in 2010. In its 23 years under the direction of William Steinberg, the Pittsburgh Symphony Orchestra remained a superb ensemble and developed an eager and devoted following. By 1961, audiences had increased 250 percent. What's more, in the five preceding years, the Pittsburgh Symphony was the only American orchestra to sell out