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,
Tanglewood Festival Chorus the Ninth as the closing concert of the Tanglewood season that summer and expressed a preference to conduct it at Symphony Hall rather than Beethoven's Fifth Symphony which Steinberg had been scheduled to conduct. In December 1994 the chorus joined Seiji Ozawa and the Boston Symphony Orchestra for tour performances in Hong Kong and Japan, the chorus' first performance overseas. In February 1998, singing from the General Assembly Hall of the United Nations, the chorus represented the Americas when Seiji Ozawa led the Winter Olympics Orchestra with six choruses on five continents, all linked by satellite, in the "Ode to