Tag Size: S Chest - armpit to armpit, lying flat - 18.75" Length - top of shoulder, at neckline to bottom of shirt - 26.25" MTV (originally an initialism of Music Television) is an American pay television channel owned by Viacom Media Networks (a division of Viacom) and headquartered in New York City. The channel was launched on August 1, 1981, and originally aired music videos as guided by television personalities known as "video jockeys" (VJs).