American Public Media
American Public Media, a private, nonprofit 501(c)(3) corporation, is the largest owner and operator of public radio stations in the United States and a major source of programming for them. It is the largest producer and distributor of classical music programming in the country.
Starting as a single college station in 1974, it grew to regional networking and programming, and became American Public Media in 2004. Over 800 public and commercial stations carry its programming.