The NBC Symphony Orchestra was a radio orchestra conceived by David Sarnoff, the president of the Radio Corporation of America, the parent corporation of the National Broadcasting Company especially for the conductor Arturo Toscanini. The NBC Symphony Orchestra performed weekly radio broadcast concerts with Toscanini and other conductors and several of its players served in the house orchestra for the NBC Radio Network. NBC encouraged the public’s perception of the Orchestra as a full-time organization exclusively at Toscanini’s beck and call, but Fortune disclosed in 1938 that these instrumentalists played other radio—and, later, television—broadcasts: “the Toscanini concerts have been allocated only fifteen of the thirty hours a week each man works, including rehearsals.”

The National Broadcasting Company's NBC Radio Network was an American commercial radio network which was in continuous operation from 1926 through 1999. Along with the NBC Blue Network, it was one of the first two nationwide networks established in the United States. Its major competitors were the Columbia Broadcasting System (CBS), founded in 1927, and the Mutual Broadcasting System, founded in 1934. In 1942, NBC was required to divest one of its national networks, so it sold NBC Blue, which was soon renamed the American Broadcasting Company (ABC). After this separation, the Red Network continued as the NBC Radio Network.