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,
Boston Symphony Orchestra newly created BSO Choral Director, both with immediate effect. The Boston Symphony made its first acoustical recordings in 1917 in Camden, New Jersey for the Victor Talking Machine Company conducted by Karl Muck. Among the first discs recorded was the finale to Tchaikovsky's fourth symphony. Under Serge Koussevitzky, the orchestra made its first electrical recordings, also for Victor, in the late 1920s. These electrical recordings included Ravel's "Boléro". Recording sessions took place in Symphony Hall. Koussevitszy's final recording with the Boston Symphony was a high fidelity version of Sibelius' Symphony No. 2, recorded in 1950 and released on LP. In