Teenagers these days have almost limitless sources for finding new music: legal services like iTunes or Amazon MP3, illicit services like FrostWire or Bittorrent, social networking sites like MySpace and Facebook, music blogs, band websites, YouTube, music videos on demand and music channels from their cable provider, satellite radio… even “old fashioned” technology like MTV. It seems that the original “information superhighway” – terrestrial radio – has been all but forgotten these days.
But back in the 50s and 60s, AM radio was the Internet. Teens relied on their radios to bring them the latest music from faraway places like Liverpool, England or Memphis, Tennessee. Music began to bloom everywhere like wildflowers. Entire genres of music, like soul and R&B, were exposed to mainstream white audiences for the first time. And no single radio station and no single DJ did more to help spread the gospel than XERF and Wolfman Jack.
To understand how XERF and Wolfman Jack changed the world, we unfortunately have to start with science and politics.
Below is a sample of a radio wave:

FM radio works by modulating the frequency of the radio wave (hence, FM = “frequency modulation”). The peaks and troughs of the radio wave get closer together or farther apart, depending on what’s being broadcast. In other words, you could stretch the right and left edges of the above picture (or squeeze them together) to “see” what an FM wave would look like. FM radio waves are short and cannot travel very far, nor can they penetrate tall buildings or mountains. This is why you lose an FM station when you enter a tunnel, for instance.
AM radio, by contrast, works by modulating the amplitude of the radio wave (hence, AM = “amplitude modulation”). With AM, the peaks get higher or lower, depending on what’s being broadcast. So you could take the image above and stretch the top and bottom sides (or squeeze them together) to “see” an AM wave. Unlike FM, AM waves are very long, and can easily pass through buildings or mountains. In fact, AM waves are so long that they can bounce off the earth’s ionosphere at night and travel in all sorts of directions. If you’ve ever listened to a nighttime call-in show on a local talk radio station, you might have heard people calling in from several states over. This is because the radio waves are bouncing off the ionosphere and landing hundreds of miles away. But more on that later.
In the early part of the 20th century, the United States, being an industrial giant, took a commanding “lead” in the number of radio stations it had versus Canada and Mexico. For this reason – as well as the usual American arrogance – when it came time to pass the North American Radio Broadcasting Agreement in 1941, the US had made into law what had already been practiced for two decades: a huge chunk of the available airwaves went to the US. Canada received the lion’s share of the remaining bandwidth, and Mexico received… next to nothing. The Mexican government, miffed at being snubbed by the Yanquis, decided to fight back by allowing their radio stations to broadcast at up to 500,000 watts, although most stations drew the line at 250,000. This was several times the power of any American radio station, which were limited to 50,000 watts by the FCC.
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