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Developed by Nathaniel Baldwin, which he made by hand (so they weren't suitable for comfort). These were only used by professionals, such as the radio operators and for telephone exchanges.
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A German company called Beyerdynamic created the first pair of dynamic headphones. These were still not available to the public.
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As WWII was going on, the German company stopped production. They started up again in the 1950's and released a device that is now used in record bars.
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John C.Koss created headphones that could be used to listen to music. He introduced and demonstrated these to the public, who loved them (these headphones are still used today).
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Celebrities began to use Koss headphones to advertise them and raise the device's popularity. More people started to incorporate headphones into their everyday lives.
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These headphones weighed less and had less distortion in the audio. However, people did not realize that they needed lighter headphones until later on in development.
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Sony created the Walkman, which needed lighter headphones. These introduced more portable music devices.
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Lightweight headphones were very popular. These also fit much better inside people's ear canals, which limited injury.
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The earbuds that came with Apple's iPod created a sudden interest in light headphones. These still weren't perfect, as the audio needed to be turned up loudly to make up for low quality sound.
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These expensive headphones became more popular because of celebrity endorsements. Their sound quality was revolutionary and more people wanted to pay a large amount of money for good headphones.
