input: Bobby Fischer was born at Michael Reese Hospital in Chicago, Illinois, on March 9, 1943. His birth certificate listed his father as Hans-Gerhardt Fischer, also known as Gerardo Liebscher, a German biophysicist. His mother, Regina Wender Fischer, was a US citizen, born in Switzerland; her parents were Polish Jews. Raised in St. Louis, Missouri, Regina became a teacher, registered nurse, and later a physician.  After graduating from college in her teens, Regina traveled to Germany to visit her brother. It was there she met geneticist and future Nobel Prize winner Hermann Joseph Muller, who persuaded her to move to Moscow to study medicine. She enrolled at I.M. Sechenov First Moscow State Medical University, where she met Hans-Gerhardt, whom she married in November 1933. In 1938, Hans-Gerhardt and Regina had a daughter, Joan Fischer. The reemergence of anti-Semitism under Stalin prompted Regina to go with Joan to Paris, where Regina became an English teacher. The threat of a German invasion led her and Joan to go to the United States in 1939. Hans-Gerhardt attempted to follow the pair but, at that time, his German citizenship barred him from entering the United States. Regina and Hans-Gerhardt had separated in Moscow, although they did not officially divorce until 1945.  At the time of her son's birth, Regina was "homeless" and shuttled to different jobs and schools around the country to support her family. She engaged in political activism, and raised both Bobby and Joan as a single parent.  In 1949, the family moved to Brooklyn, New York City, where she studied for her master's degree in nursing and subsequently began working in that field.

Answer this question "when was he born?"
output: Bobby Fischer was born at Michael Reese Hospital in Chicago, Illinois, on March 9, 1943.

Problem: Background: James was born in Holton, Kansas; his mother, died in 1954 when he was five. His father was a janitor and a handyman. After four years at the University of Kansas residing at Stephenson Scholarship hall, James joined the Army in 1971. He was the last person in Kansas to be sent to fight in the Vietnam War, although he never saw action there.
Context: An aspiring writer and obsessive fan, James began writing baseball articles after leaving the United States Army in his mid-twenties. Many of his first baseball writings came while he was doing night shifts as a security guard at the Stokely-Van Camp's pork and beans cannery. Unlike most writers, his pieces did not recount games in epic terms or offer insights gleaned from interviews with players. A typical James piece posed a question (e.g., "Which pitchers and catchers allow runners to steal the most bases?"), and then presented data and analysis written in a lively, insightful, and witty style that offered an answer.  Editors considered James's pieces so unusual that few believed them suitable for their readers. In an effort to reach a wider audience, James began self-publishing an annual book titled The Bill James Baseball Abstract beginning in 1977. The first edition, titled 1977 Baseball Abstract: Featuring 18 categories of statistical information that you just can't find anywhere else, presented 68 pages of in-depth statistics compiled from James's study of box scores from the preceding season and was offered for sale through a small advertisement in The Sporting News. Seventy-five people purchased the booklet. The 1978 edition, subtitled The 2nd annual edition of baseball's most informative and imaginative review, sold 250 copies. Beginning in 1979, James wrote an annual preview of the baseball season for Esquire, and continued to do so through 1984.  The first three editions of the Baseball Abstract garnered respect for James's work, including a very favorable review by Daniel Okrent in Sports Illustrated. New annual editions added essays on teams and players. By 1982 sales had increased tenfold, and a media conglomerate agreed to publish and distribute future editions.  While writers had published books about baseball statistics before (most notably Earnshaw Cook's Percentage Baseball, in the 1960s), few had ever reached a mass audience. Attempts to imitate James's work spawned a flood of books and articles that continues to this day.
Question: What were the Baseball Abstracts?
Answer: Featuring 18 categories of statistical information that you just can't find anywhere else, presented 68 pages of in-depth statistics compiled from James's study

Question: The Alexandrov Ensemble (Russian: Ansambl' Aleksandrova, tr. Ansambl' Aleksandrova; commonly known as the Red Army Choir in the West) is an official army choir of the Russian armed forces. Founded during the Soviet era, the ensemble consists of a male choir, an orchestra, and a dance ensemble.

In 1948 much of Berlin was still ruined after World War II, and the city was divided into four occupation zones, controlled by the USSR, France, the UK and the United States. This was before the Berlin Wall was built, and it was still possible to travel between zones. An American officer suggested a concert in the Gendarmenmarkt (in the Soviet zone at the time), and the French zone commander supported the suggestion. The musicians were to be provided by the USSR, and the Alexandrov Ensemble was chosen. A temporary stage was set up in the square, with flowers all along the front. 30,000 people came to stand and watch for three hours. In 1994, towards the end of his life, Boris Alexandrov said:  "The visit to Germany was unforgettable. It is dominant in the history of the ensemble. It was necessary to make a new creative leap - from wartime military music to postwar relaxing harmony. It was important, and the transition had to be managed on many fronts, including getting the Ensemble back into its original pre-war role, performing the classics and singing folk songs. Before the war the Ensemble had 200 professional singers; following the war it was down to 60."  A previous tour to East Germany had been cancelled due to the sudden death of Alexander Alexandrov in 1946 in Potsdam, when in his bed was found an annotated copy of Beethoven's Symphony No. 9, showing that A. Alexandrov had been preparing the final chorus for a performance. Now Boris, his son, was ready to follow his father's plan. The 1948 peace concert was to consist of German opera extracts and Russian folk songs (Nightingales, Zemlyanka and Roads); and after an intervention by the tenor Victor Nikitin, some German folk songs were also included. The people joined in, singing Heidenroslein, and Nikitin sang Kalinka three times in a row. The concert was very successful, and very moving.   A sound recording of the concert was made, and pressed in 1985 under the Radio DDR 1 label. This is listed on the Alexandrov Ensemble discography page.  However the Berlin Peace Concert did not happen in isolation. It was part of a series of punishing yearly tours to war-torn areas. The main tour season during and just after World War II appears to have run from June to October - perhaps because the large troupe usually had to perform outdoors, to accommodate large audiences. The August 1948 Berlin concert occurred two-thirds of the way through a tour to (20 June to 18 July) Prague, Most, Brno, Devin, Bratislava, Moravska Ostrava, Zilina and Kosice in Czechoslovakia; then apparently without a break (18 July to 10 October) Dresden, Weimar, Magdeburg, Stendal, Schwerin, Potsdam, Berlin, Rathenow, Leipzig, Halle, Lane, Erfurt, Chemnitz, Frankfurt an der Oder and Schwarzenberg in Germany.  In 1990, the ensemble participated in Roger Waters' The Wall concert celebrating the fall of the Berlin Wall. They performed an anti-war song, Bring the Boys Back Home.

Using a quote from the above article, answer the following question: what role did Alexandrov play in the peace concert?
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Answer:
The musicians were to be provided by the USSR, and the Alexandrov Ensemble was chosen.