Am 640? You must be from LA, I do not recall them as a music station. I recall them as the Dodgers station!
In 1960, I had a tiny radio, shaped like a satellite, that got two radio stations fairly well—KRLA, a 50,000-watt station, whose transmitter was located in nearby South El Monte, and KFI, also 50,000 watts, with its transmitter and mast, built in 1948, over on the Orange County-LA County border. Dodger games—announced by Vin Scully—music and variety could be heard over KFI.