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 and popular music, Tanglewood provides musical training. In 1940 conductor Serge Koussevitzky initiated a summer school for approximately 300 young musicians, now known as the Tanglewood Music Center. Also, nearby is the Boston University Tanglewood Institute (BUTI) for high school students and Days in the Arts (DARTs) for middle school students. Other youth-symphony organizations have performed at either the Music Shed or Ozawa Hall, including the Norwalk Youth Symphony, from Norwalk, Connecticut, the Empire State Youth Orchestra, from Albany, New York, and the Greater Boston Youth Symphony (currently known as the Boston Youth Symphony Orchestras). Tanglewood Tanglewood is a music