3C10  The Ear
3C20  Pitch
            .30 Siren Disc
            .40 Gear and Card
3C30  Intensity and Attenuation
3C40  Architectural Acoustics
3C50  Wave Analysis and Synthesis
            .10 Fourier Synthesizer
3C55  Music Perception and The Voice
            .55 Tuning Forks on Resonant Boxes
            .80 Vocal Formants