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On the sign:
LEOPOLD STOKOWSKI SOCIETY - LONDON
LEOPOLD ANTHONY STOKOWSKI - MUSICIAN - 1882 - 1977 Attended this school
The building with the sign on it was photographed that day by the same photographer Click for a larger image
The sign is on the wall of the school where the renowned conductor studied. The additional sign in front of the house that appears in the photo, indicating St Marylebone Parish Church, is also associated with the conductor’s past - Stokowski participated in the church choir.