Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of online music streamer Pandora Media (P) have popped today by as much as 10% following an analyst upgrade.

So what: Morgan Stanley boosted its rating on Pandora from "equalweight" to "overweight," while assigning a $24 price target. The analyst believes that Pandora is the best way to capitalize on the shift to online radio, since Pandora is a "pure play" on the sector.

Now what: Analyst Scott Devitt characterizes Pandora as the "Netflix of Radio," saying the company offers a disruptive form of content consumption. Even as rivals continue to enter with competing streaming services, Pandora remains the market leader and its expansion into other areas like automobiles may strengthen its position, according to Devitt. One key distinction is that the bulk of Pandora's revenue comes from advertising, while Netflix has no advertising revenue.

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