Inside mad and controversial world of MTV that launched careers of Davina and string of stars as channel closes for good

WHEN MTV launched in 1981 as the world’s first 24-hour rolling music channel, it ushered in an exciting era for pop culture. The first clip to air was an iconic choice, The Buggles’ Video Killed The Radio Star — yet four decades on, it is streaming that has killed the video star. At 5.59am tomorrow,…