Programming Note: Watch CNN Original Series “ Live Aid: When Rock ’n’ Roll Took On the World,” celebrating the definitive story of how two rockstars inspired the largest global music events in history. The four-part series premieres Sunday, July 13 at 9pm ET/PT. CNN  —  “Alright, where’s Tina?” With that short introduction from Mick Jagger and the beat of the drums, Tina Turner danced onto a Philadelphia stage for a electrifying performance with the Rolling Stones frontman during Live Aid on