In 2018, Ms. Mutter played “The Fifth Season,” for violin and piano, which she and Carnegie Hall had commissioned. She described it as “rather lighthearted.”
This year, Tanglewood had planned events to celebrate Mr. Previn’s 90th birthday, including a performance of the violin concerto “Anne-Sophie” with Ms. Mutter and, with Ms. Fleming and the Emerson quartet, the premiere of “Penelope,” by Mr. Previn and the playwright Tom Stoppard. Tanglewood said the events would now be framed as a celebration of his life and work, although it was not immediately clear if Mr. Previn had finished “Penelope.”
Mr. Previn wrote several books, including “Orchestra” (1979), a depiction of the lives of orchestral musicians, and a memoir of his movie experiences, “No Minor Chords: My Days in Hollywood” (1991).
Mr. Previn’s first wife, Betty Bennett, was a singer he had seen in San Francisco jazz clubs. They had two daughters, Claudia and Alicia, also known as Lovely (who became a violinist in the Irish band In Tua Nua), and divorced in 1958.
His second marriage was to Dory Langan, an MGM lyricist, who, after they separated, recorded several albums as a singer-songwriter under the name Dory Previn, many of them reflections on their breakup and its aftermath. Dory Previn died in 2012.
Their divorce in 1970 was prompted by the well-publicized affair between Mr. Previn and Ms. Farrow, who had been a friend of Ms. Previn’s. Ms. Farrow divorced Sinatra in 1968 and married Mr. Previn in 1970. They had three children, Matthew and Sascha, who were twins, and Fletcher. They also adopted three daughters: Summer Song, known as Daisy; Soon-Yi, who married Woody Allen in 1997; and Lark, who died in 2008.
Mr. Previn’s fourth wife was Heather Haines Sneddon. They had a son, Lukas, in 1984, and divorced in 1999, the year he wrote the violin concerto for Ms. Mutter. He and Ms. Mutter married in 2002 and divorced in 2006 but continued to perform together.