Memoranda concerning problems associated with the merger of the Philharmonic Society and the New York Symphony Society; LS-Furtwaengler, Wilhelm, re inability to perform in New York in 1929-30 season; LS-Arthur Judson; LS-Clarence H. Mackay, numerous, dealing with operations of the Philharmonic-Symphony Society; Service of Clarence Mackay as Chairman of the National Symphony Society; Efforts to recruit Arturo Toscanini as Musical Director of the merged Philharmonic-Symphony; Plans for the first season under Toscanini and Mengelberg, 1927-28; Change in subscription series beginning 1928-29; Plans for a new hall; Engagement of Sir Thomas Beecham as Guest Conductor, season 1927-28; Dismissal of 21 orchestra members and hiring 17 additional men recommended by Arturo Toscanini in 1928; Proposed Concert Schedule, 1928-1929; Request by Toscanini for a special Philharmonic chorus; Delay of proposed European tour under Toscanini to Spring 1930; Recording contract with Victor Talking Machine Company; Complaint by Damrosch that making recordings during the period he conducted the orchestra would tire the musicians; Question of extending contract with Mengelberg, February 1929; Toscanini conducting schedule and demands, February 1929; Proposal to engage Wilhelm Furtwaengler as Guest Conductor; Decision by Walter Damrosch not to renew his association with the Philharmonic, February 1929; Concert under the auspices of the American Academy of Arts and Letters, 24 April 1929; Mengelberg's request to do Mahler's "Das Lied von der Erde" in January 1930 at his last concerts; Furtwaengler's conditions for accepting a Philharmonic engagement, December 1929; Agreement, later rescinded, for Mengelberg to share conducting duties with Toscanini on the 1930 European tour; Conflict between Toscanini and Mengelberg, leading to termination of Mengelberg's association with the orchestra; Proposal to engage Otto Klemperer as guest conductor; Mrs. E. H. Harriman's support of the Children's Concerts for 1929-30 under Ernest Schelling; Problems concerning Toscanini engagement with San Francisco Symphony