The Chicago Symphony Chorus began on September 22, 1957, when the Chicago Symphony Orchestra (CSO) announced that Margaret Hillis would organize and train a symphony chorus. The music director Fritz Reiner's original intent was to utilize the chorus for the two weeks of subscription concerts that season, performing George Frideric Handel's Messiah in December and Giuseppe Verdi's Requiem in April. When Bruno Walter informed the orchestra's management that his March 1958 appearances would be his last in Chicago, the board president, Eric Oldberg, insisted that Walter conduct Wolfgang Amadeus Mozart's Requiem utilizing the new chorus. During that first season, it was logistically impossible for Hillis to audition and prepare a new Chorus for three major works within less than four months. As an interim fix, the Apollo Chorus of Chicago was used for the Christmas Messiah concerts.
