🇨🇦12/24 - First day of the radio broadcast started.(1906, by Reginald Fessenden)

The invention of amplitude-modulated (AM) radio, so that more than one station can send signals (as opposed to spark-gap radio, where one transmitter covers the entire bandwidth of the spectrum) is attributed to Reginald Fessenden and Lee de Forest. According to some sources, notably Fessenden's wife Helen's biography, on Christmas Eve 1906, Reginald Fessenden used an Alexanderson alternator and rotary spark-gap transmitter to make the first radio audio broadcast, from Brant Rock, Massachusetts.

Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible. However, Fessenden himself never mentioned that date: rather, he wrote of experiments with voice as early as 1902. And some of his experiments with voice and music, which occurred in mid-to-late December 1906, were reported in the American Telephone Journal.