Acoustic measurements in the Philharmonic (Avery Fisher) Hall are reviewed. The subjective testing of 22 European concert halls, as well as several new methods for effectively diffusing sound are described. These methods, which are based on number theory, are also useful as sound scatterers for recital hall and studio design. An accurate method for calculating sound decay due to E. Gilbert is reviewed. Acoustic measurements made with music as the test signal (with the audience in place) during live performances are described. An ingenious method, suggested by A. Kohlrausch, for evaluating "colorless" artificial reverberation is pointed out.
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