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 Pops Orchestra that aired on 1988. In 1991, the orchestra played Bill Monroe's "Uncle Pen" and other bluegrass classics with Ricky Skaggs and the Kentucky Thunder. Keith Lockhart assumed the post of principal Pops conductor in 1995. Lockhart continues to conduct the Boston Pops today, adding a touch of flamboyance and a flair for the dramatic to his performances. Williams remains the Laureate Conductor of the Pops and conducts a week of Pops concerts every year, two nights at Symphony Hall each spring and two nights at the Ozawa Hall in Tanglewood each summer. Lockhart has brought in numerous pop-music acts and