New York Philharmonic concert of April 6, 1962

The New York Philharmonic concert of April 6, 1962, is widely regarded as one of the most controversial in the orchestra's history. Featuring a performance by Glenn Gould of the First Piano Concerto of Johannes Brahms, conducted by its music director, Leonard Bernstein, the concert became famous because of Bernstein's remarks from the podium prior to the concerto.

Source: Wikipedia — New York Philharmonic concert of April 6, 1962 (CC BY-SA 4.0)