Billboard is an international newsweekly magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis. The two most notable charts are the Billboard Hot 100, which ranks the top 100 songs regardless of genre and is based on digital sales, radio airplay, and internet streaming data; and the Billboard 200, the corresponding chart for album sales. Billboard was founded in Cincinnati on November 1, 1894, by William h. Donaldson and James Hennegan. Originally titled Billboard Advertising it was a trade paper for the bill posting industry, hence the magazine's name.
Contributions by Ericorbit, Musicpvm, and Woohookitty.