Billboard is a weekly magazine devoted to the music industry, and is one of the
oldest trade magazines in the world. On July 20, 1940 the first The Billboard 
Music Popularity Chart was published. Billboard currently puts out over 100
charts each week, the most popular ones being Hot 100,Billboard 200, and
Hot 100 Airplay. Billboard was founded in Cincinnati, Ohio on November 1,
1894, by William H. Donaldson and James H. Hennegan. Originally titled
Billboard Advertising it was a trade paper for the bill posting industry,
hence the magazine’s name.