2.  Audio is an electrical or other representation of sound.

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

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

5.  Edison introduces an electric motor- driven phonograph.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

20.  BASF prepares the first plastic-based magnetic tapes.

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

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

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

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

25.  Ampex produces its first tape recorder, the Model 200

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

27.  IBM develops a commercial magnetic drum memory

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

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

30.  http://en.wikipedia.org/wiki/Audio http://en.wikipedia.org/wiki/Audio  http://dictionary.reference.com/browse/ audio?s=t http://dictionary.reference.com/browse/ audio?s=t  http://www.aes.org/aeshc/docs/audio.h istory.timeline.html http://www.aes.org/aeshc/docs/audio.h istory.timeline.html