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On the sign:
CITY OF WESTMINSTER
THE BRITISH PREMIERE OF BEETHOVENS NINTH SYMPHONY COMMISSIONED BY THE PHILHARMONIC SOCIETY OF LONDON WAS GIVEN ON 21 MARCH 1825 IN THE AGRYLL ROOMS CONCERT HALL ON THIS SITE
The Plaque is located in the place where Argyll Rooms resided, which was home to the London Philharmonic Society. There, Beethovens Ninth Symphony performed for the first time (about a year after its writing ended)