On this day in Music History - November 11, 1955 — Billboard magazine made chart history when it introduced The Top 100, a brand-new format that forever changed the way America measured musical success. Before this date, Billboard tracked separate charts for record sales, radio airplay, and jukebox popularity. But beginning in November 1955, the magazine combined all three factors — sales, radio spins, and jukebox plays — into one unified ranking. It was the birth of the modern pop chart as we k