NIS akakwezva akawanda gumi nematanhatu kunyoresa zviteshi, asi nekudonha kwa1976, NBC yakasarudza kuti yaisakwanisa kufungidzira kuti sevhisi yaizombove inobatsira uye yakapa vanobatana nemwedzi mitanhatu chiziviso chekuti yaizomiswa. NIS yakavhurwa muna Chivabvu 29, 1977. Muna 1979, NBC yakatanga The Source, yakabudirira zvine mwero yechipiri network inopa nhau pfupi uye maficha kune FM rock nhepfenyuro. Iyo NBC Radio Network yakatamburawo neyakajairwa nhepfenyuro nhepfenyuro ine yakaparadzirwa-satellite hurukuro yemanheru, asi yakabvumidza Bruce Bernard kuunza sevhisi paWRC muWashington, uye pane yayo-uye-inoshanda FM nhepfenyuro muNew York City, Chicago neSan Francisco. NIS yakakwezva akati wandei gumi nematanhatu ekunyorera nhepfenyuro, asi nekudonha kwa1976, NBC yakaona kuti yaisakwanisa kufungidzira kuti sevhisi yaizombove inobatsira uye ikapa vanobatana nemwedzi mitanhatu chiziviso chekuti yaizomiswa.
June 18, 1975