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Invented by Nikola Tesla. Started with the discovery of "radio waves." Radio waves are electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication.
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First radio created with an FM radio, invented by Edward Armstrong.Used to change to AM to FM quickly. FM usually play music, while AM played shows, plays, ect..
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This next radio was very similar to the one before, except it was smaller which made it possible to travel around with, unlike the first one which was too huge.
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Unlike the radios before which was used mainly of the purpose of listening to favorite shows, plays ect.. This radio was made for the 70's rock & roll. Also, it was more portable than previous ones.
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Created and designed to play loud music. People often carried these around with them on the streets, parks, cookouts, ect..
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Now, satellite radio is most used. In the 2000s the XM Radio and Sirius Satellite Radio began. Over varies amounts of channels covering wide amounts of space from sports to music.