FamousNBC Chimes ChordNBC network chimes (radio, later television), 1931 · NBC (National Broadcasting Company); credited variously to NBC staff including Ernest La Prade, Oscar Hanson and Rudolf Schwarz, reduced from an earlier seven-note version
The station identification chimes at the end of NBC programmes; still NBC's audio logo
NBC's famous three-note chime is the notes G, E and C, played one after another on bells, which together spell a C major chord with G at the bottom. Many people believe the notes stand for General Electric, NBC's old owner, though historians dispute that. On guitar you can let the three notes ring together using just one finger: the open G string, the B string at the first fret (C) and the open top E string.
Also called NBC chimes, G-E-C chimes
Sources: NBC chimes (Wikipedia) · NBC Chimes Museum (nbcchimes.info): the Deagan chime units · The NBC Chimes Machine (oldradio.com) · November 29, 1929: The NBC Chimes Sound For The First Time (Eyes of a Generation)