 Audio is an electrical or other representation of sound.

 Audio is Sound, esp. when recorded, transmitted, or reproduced.

 The first music is put on record: cornetist Jules Levy plays "Yankee Doodle."

 Edison introduces an electric motor- driven phonograph.

 Valdemar Poulsen patents his "Telegraphone," recording magnetically on steel wire.

 Boston's Symphony Hall opens with the benefit of Wallace Clement Sabine's acoustical advice

 Lee DeForest invents the triode vacuum tube, the first electronic signal amplifier

 Enrico Caruso is heard in the first live broadcast from the Metropolitan Opera, NYC

 Major Edwin F. Armstrong is issued a patent for a regenerative circuit, making radio reception practical.

 Edison does live-versus-recorded demonstrations in Carnegie Hall, NYC.

 The Radio Corporation of America (RCA) is founded. It is owned in part by United Fruit.

 The first commercial AM radio broadcast is made by KDKA, Pittsburgh PA.

 O'Neill patents iron oxide-coated paper tape.

 The Japan Victor Corporation (JVC) is formed as a subsidiary of the Victor Talking Machine Co

 Dr. Georg Neumann founds a company in Germany to manufacture his condenser microphones. Its first product is the Model CMV 3.

 Harry Nyquist publishes the mathematical foundation for the sampling theorem basic to all digital audio processing, the "Nyquist Theorem."

 Arthur Keller and associates at Bell Labs in New York experiment with a vertical- lateral stereo disk cutter.

 The first cardioid ribbon microphone is patented by Dr. Harry F. Olson of RCA, using a field coil instead of a permanent magnet.

 BASF prepares the first plastic-based magnetic tapes.

 Walt Disney's "Fantasia" is released, with eight-track stereophonic sound.

 Arthur Haddy of English Decca devises the first motional feedback, lateral-cut disk recording head, later used to cut their "ffrr" high-fidelity recordings.

 Arthur Haddy forms Ampex Corporation to make electric motors for the military.

 Brush Development Corp. builds a semiprofessional tape recorder as its Model BK401 Soundmirror.

 Ampex produces its first tape recorder, the Model 200

 Scotch types 111 and 112 acetate-base tapes are introduced.

 IBM develops a commercial magnetic drum memory

 Guitarist Les Paul modifies his Ampex 300 with an extra preview head for "Sound- on-Sound" overdubs.

 An "Ultra-Linear" amplifier circuit is proposed by Hafler and Keroes

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