The head of the activist hedge fund that's pushed for a Pandora sale said its deal with SiriusXM sets the music platform up for a turnaround. "I think there's a huge new opportunity for a new Pandora 2.0," Keith Meister, CEO of Corvex Management, said Friday on CNBC's "Halftime Report." Pandora shares are down more than 30 percent year-to-date. Shares...