Media in New York City have their editorial offices based in the city. New York is home to the corporate headquarters of such publishing giants as: Among other national leaders based in New York city are "Newsweek", owned by The Newsweek Daily Beast Company", and Rolling Stone", published by Wenner Media. In the 1930s, New York-based RCA was the nation's largest manufacturer of phonographs. In the late 19th and early 20th century, most sheet music in the United States — especially the popular songs of the day, many now standards — was printed at Tin Pan Alley, so called because the constant sound of new
Media of Bulgaria concentration on the basis that it would not establish or increase a dominant position in the distribution market. According to the Media Pluralism Monitor, "concentration of media ownership is very high". The top 4 major owners in the broadcasting sector have an aggregated market share (based on advertising revenue only) of 93.35%. The top 4 major owners of daily newspapers reach an aggregated market share of 79.7%. As for Internet Service Providers (ISPs), they have an estimated market share which is above 50%. Concentration trends are also present in terms of audience and readership whose concentration is "very high" according