Documents relating to Bolt, Beranek and Newman, Inc., acoustical consultants on Philharmonic Hall; Complaints registered by Leonard Bernstein concerning acoustics in Philharmonic Hall; Schedule of acoustical tests to be made during rehearsals at Philharmonic Hall; Meeting between Leonard Bernstein and consultants to discuss acoustical problems encountered on stage in Philharmonic Hall; Report entitled "Acoustic of Philharmonic Hall Recommended Adjustments" including plans and drawings for proposed ceiling changes.