 Between 1900 and 1920 the first technology for transmitting sound by radio was developed, AM (amplitude modulation), and AM broadcasting sprang up around 1920.On Christmas Eve 1906, Reginald Fessenden is said to have broadcast the first radio program, consisting of some violin playing and passages from the Bible.While Fessenden's role as an inventor and early radio experimenter is not in dispute, several contemporary radio researchers have questioned whether the Christmas Eve broadcast took place, or whether the date was, in fact, several weeks earlier.