On November 29 in 1929, NBC began use of the three-note chimes.


The NBC chimes, named for the radio and television network on which they have been used, consists of a succession of three distinct pitches: G3, E4, and C4 (middle C), sounded in that order, creating an arpeggiated C-major chord in the second inversion, within about two seconds time, and reverberating for another two or three seconds. The intervals of this progression are up a major 6th from G3 to E4 and down a major third from E4 to C4. The chimes were the first ever audio trademark to be accepted by the U.S. Patent and Trademark Office. Contrary to widespread belief, the "G-E-C" sequence is not a reference to the General Electric Company (now a minority shareholder in NBC's current parent company), which did not acquire NBC until 1986; however, GE's radio station WGY in Schenectady, New York was an early NBC affiliate, and GE was an early shareholder in RCA, which founded NBC by creating it as a subsidiary.
The chimes were originally used as a cue for affiliated radio stations across the network to begin broadcasting their station identifications or local station breaks. After their use as a formal network communications signal ended around the 1970s as the result of automation, the chimes are used as an audio logo or signature for NBC Television. The radio network was folded into Westwood One operations.

Wikipedia | Official Site | Museum | Bill Harris' site

On this day in 1948, the soon-to-be classic puppet TV show "Kukla, Fran, & Ollie" debuted on NBC out of Chicago.

Also this day in 1948, the first opera to be televised was broadcast from the Metropolitan Opera House in New York City. "Otello", by Verdi, was presented over WJZ-TV in New York.

In 1877, November 29, Thomas Edison demonstrated his invention, a hand-cranked phonograph that recorded sound on grooved metal cylinders. Edison shouted verses of "Mary Had a Little Lamb" into the machine which played back his voice.

Read more: http://www.upi.com/Odd_News/2011/11/29/The-almanac/UPI-90621322555400/#ixzz1f5pWk25w

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