Following news that Pandora Media Inc.'s (P) stock was halted premarket on Tuesday morning, the radio Internet service officially announced the resignation of CEO Tim Westergren after rampant speculation. As Pandora launches a search for a new ringleader, Finance Chief Naveen Chopra will step in as interim CEO. 

Read More: Sirius in Charge, Pandora CEO Tim Westergren Departs Radio Internet Company

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