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Created sometime in the 15th century, the guitar has changed music since it was conceived.
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Created around the year 1700, the piano has been mostly unchanged since the beginning.
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The first device capable of recording sound signals was Léon Scott de Martinville’s 1857 invention called the “phonautograph.” -- http://www.randomhistory.com/2008/08/04_ipod.html
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Thomas Edison’s tinfoil cylinder phonograph made the first recording of the human voice in 1877. - http://www.randomhistory.com/2008/08/04_ipod.html
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The first radio broadcast was transmitted from Brant Rock, Massachusetts to the general public for entertainment and music.
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Headphones originated from the earpiece, and were the only way to listen to electrical audio signals before amplifiers were developed. The first truly successful set was developed in 1910 by Nathaniel Baldwin, who made them by hand in his kitchen and sold them to the United States Navy. - https://en.wikipedia.org/wiki/Headphones#History
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In 1963, Phillips introduced the audio cassette tape format that eventually became popular among home audio enthusiasts. Analog cassette systems displaced the 8-track, but other systems remained popular for high fidelity applications among professionals until the advent of digital recorders. LPs, incidentally, remained in high production through the 1980s and continue to be manufactured to the present day. - http://www.randomhistory.com/2008/08/04_ipod.html
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At first, it was only meant to play sound recordings, but later they adapted to store storage. The first popular CD was produced by the music group ABBA.
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The iPod is a line of portable media players and multi-purpose pocket computers designed and marketed by Apple Inc. The first version was released on October 23, 2001, about 8½ months after iTunes was released. The most recent iPod redesigns were announced on July 15, 2015. - https://en.wikipedia.org/wiki/IPod
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iPhone is a line of smartphones designed and marketed by Apple Inc. They run Apple's iOS mobile operating system. The first generation iPhone was released on June 29, 2007; the most recent iPhone model is the iPhone 7, which was unveiled at a special event on September 7, 2016. - https://en.wikipedia.org/wiki/IPhone
