However , the first public performance of the SFGMC took place less than a month later , on November 27 , at an impromptu memorial at San Francisco City Hall for Milk and Mayor George Moscone , who had been assassinated earlier that day by former Supervisor Dan White . The SFGMC performed " Thou , Lord , hast been our refuge " ( " Herr Gott , du bist unsre Zuflucht " ) by Mendelssohn at the event , which was attended by at least 25,000 – 40,000 mourners who had marched to the City Hall from Castro Street , which was represented by Milk in the Board of Supervisors
assassinated
Moscone–Milk assassinations
San Francisco Gay Men's Chorus