years later, RCA was repurchased and made defunct by GE, which rechristened the RCA Building to the "GE Building", and later the "Comcast Building" after GE divested itself of NBC. The small handheld chimes commonly used when the NBC chime sequence was being developed had only four tones: G, F, C and E. Given these limited choices, it was most likely only a coincidence that the adopted sequence matched GE's initials, and while useful as a mnemonic for remembering the notes' correct sequence, there is little evidence actually supporting any link. Early radio station sound signatures Because radio is sound oriented, it was a natural development for stations to independently adopt a variety of audio signatures, which in some cases took the form of chimes. Examples existed from the earliest days of organized broadcasting, including at least three by the summer of 1923: WSB in Atlanta, Georgia claims it was the first station to sound a musical identification at the end of programs, using a four-bar xylophone given to station manager Lambdin Kay by a performer, Nell Pendly. A three note signature, E-G-C, was developed, based on the first three notes from the chorus of the World War One classic "Over There". WHAS in Louisville, Kentucky. Station manager Credo Fitch Harris, who wrote in his memoir "what devil put the idea in my head to begin with, may never be known", in 1922 had eight metal chime bars constructed so that he could play — "with fear and trembling, lest the do-dad I struck with hit the wrong thing" — the chorus of "My Old Kentucky Home" at station sign-offs. KFI in Los Angeles, California. The caption on a 1923 photograph of the station's studio mentioned the "electric chimes which open and close the program". Introduction of the NBC chimes What differentiated the NBC chimes from these earlier identifying sounds, at least in the beginning, is the use of the NBC chimes for network communications and coordination. Later they would also become a signature sound representing the network, but their primary initial purpose was to help ensure smooth network operations. In 1932, NBC stated that: "The purpose of the chimes... is to synchronize local station identification announcements and to serve as a cue to engineers at relay points all over the country to switch various branches of the networks on or off as the programs change every 15 minutes." This