Updated at 2:15 Monday with corrected reference to tune sung by Powell Symphony Hall protesters.

Michael Brown protesters interrupted the St. Louis Symphony Orchestra's concert on Saturday night, causing a brief delay in the performance at Powell Symphony Hall.

The orchestra and chorus were preparing to perform Johannes Brahms' Requiem just after intermission when two audience members in the middle aisle on the main floor began singing "Which Side are You On?" - an organized labor tune with origins in the infamous 1931 Harlan, Kentucky coal strike.

They soon were joined, in harmony, by other protesters, who stood at seats in various locations on the main floor and in the balcony.

The protesters then unfurled three hand-painted banners and hung them from the Dress Circle boxes. One banner listed the birth and death date of Brown, who was shot by Ferguson police Officer Darren Wilson on Aug. 9.

The five-minute interruption was met with a smattering of applause from some audience members, as well as members of the orchestra and chorus. Others simply watched as the orchestra remained silent.