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 Joy" from Beethoven's Ninth Symphony to close the Opening Ceremonies of the 1998 Winter Olympics. The chorus joined Plácido Domingo, Susan Graham, and Yo-Yo Ma in performing at the funeral service for Senator Edward Kennedy on August 28, 2009. On March 10, 2015, the Boston Symphony Orchestra announced that Oliver would retire as conductor of the TFC at the end of the summer Tanglewood season. The BSO conducted a chorus conductor search, and announced on February 2, 2017 that British conductor James Burton had been appointed as the TFC's second permanent conductor. The full roster includes over 250 singers who