Mylene Karanyan, a twelve year old Armenian girl from Moscow. On December 11, 2019, Mylene set a new world and Russia's record as a child with the widest range of voice - almost five octaves (from the "DO" of small octave C3 to the "SOL" of the fourth octave G7) and got into the Russian Book of Records.
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https://www.youtube.com/watch?v=IliTPd7VpK0