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  The first attempt of electronic music was in Canada and the United States.
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  The first electronic concert was performed at the Museum of Modern Art in New York. It was performed by on October 28, 1953.
 https://blog.oup.com/2014/03/facts-about-synthesizer-electronic-music/
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  The very first synthesizer was created.
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  The Iliiac Suite for the string quartet was composed by the Lejaren Hill and Leonard Isaacson. It was the first complete work of computer-assisted composition.
 http://www.indiana.edu/~emusic/elechist.htm
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  Robert Moog and Donald Buchla created separate companies to manufacture synthesizers
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  The voltage-controlled sound synthesizers revolutionized electronic music.
 https://www.encyclopedia.com/literature-and-arts/performing-arts/music-theory-forms-and-instruments/electronic-music
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  Robert Moog's synthesizer was released, it became a major milestone for electronic music.
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  The GROOVE was developed by Max Matthews and F. Richard Moore. It is a real time digital control system for analog synthesis.
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  Commercial Synthesizers were produced on a regular basis. http://www.indiana.edu/~emusic/elechist.htm
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  The first all-digital synthesizer was released in 1983.