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The earliest "headphones"
The earliest headphones date back to the late 19th century, and were used for radio communication. https://www.smithsonianmag.com/arts-culture/a-partial-history-of-headphones-4693742/ -
1890s, a sort of headphone was invented
In the 1890s a company called Electrophone invented a sort of headphone that their costumers could connect to live performances at theaters and opera houses around London. http://smithsonianmag.com/arts-culture/a-partial-history-of-headphones-4693742/ -
John Koss invents first music for headphones
Using headphones that were used for communication between war planes, John Koss tweaked the design and created the Koss SP-3 design. This was the beginning of the modern day headphone design. http://smithsonianmag.com/arts-culture/a-partial-history-of-headphones-4693742/ -
The modern headphones were invented
In 1979, Sony Walkman invented the modern day headphones that are known today. http://smithsonianmag.com/arts-culture/a-partial-history-of-headphones-4693742/ -
In - ear apple headphones release
In 2016, the first Apple in ear headphones were on sale. https://appleinsider.com/articles/18/09/07/the-surprisingly-long-history-of-the-apple-airpods