Pandora Media Inc. (NYSE: P) shares gained 5.9% to $18.18. Investors listened as the online-radio company posted better-than-expected quarterly sales. The monthly limit of 40 hours for mobile listening appears to have driven users to Pandora’s subscription service, which gained more than 700,000 new subscribers in the quarter. Share volume was just over one million, compared to an all-day average of 881,000
