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.

Answer the following question by taking a quote from the article: how many people attended the concert?
30,000 people came to stand and watch for three hours.