Papers of Felix M. Warburg, Board of Directors of Symphony Society 1917-1928 and of Philharmonic-Symphony Society 1928-1937, and member of the Executive Committee; LS-Felix M. Warburg, proposal (denied) for premiere of new work by Ernest Bloch, 1933; Proposal of concert series in the Bronx; Armory concert with Philip Rossiter; Concern over unspecified matter concerning conductor Bruno Walter that was not brought to the attention of the Executive Committee of the Board of Directors; Problems with the Musicians' Union, 1936; Death of Felix Warburg, October 1937