The following video is from Tuesday's Investor Beat, in which host Chris Hill and analysts Jason Moser and Matt Koppenheffer dissect the hardest-hitting investing stories of the day.

Shares of Pandora have fallen more than 12% this week on the news that Apple is gearing up to launch a music streaming service. In this installment of Investor Beat, Jason and Matt discuss how big a threat Apple poses to Pandora, what the "first-mover advantage" is really worth, and whether Pandora has a puncher's chance against what is about to be the new 800-pound gorilla in the music streaming industry. We also look at four stocks that made big moves on Tuesday's market, and two stocks we'll be watching closely this week.