On November 22nd 1963, conductor Erich Leinsdorf of the Boston Symphony Orchestra was in mid-performance when he received the news of Kennedy’s assassination.
On the other side of the Atlantic, Kingsley Amis was having dinner with the journalist George Gale. Gale took a telephone call in another room. Amis heard him shout “No!”, and then saw him pull on his coat and leave.
At Symphony Hall in Boston, the microphones were on and running. You can hear the audience respond to the horrible news. Their reaction, and that of the orchestra, does them considerable credit: