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 Pandora Media (NYSE:P) have fallen 11% today after news that a certain digital-music pioneer is making big moves in the streaming space.

So what: The bad news started coming in on Sunday when The Wall Street Journal reported on Apple's (NASDAQ:AAPL) licensing deal with Warner Music, which included some very generous ad-revenue sharing stipulations. Warner's 10% take off the top is more than double the 4% Pandora currently pays to the major labels, including Warner. Since this was coupled with news of Apple moving toward launching its own streaming music service (dubbed "iRadio," of course), it was a double whammy against Pandora's thus-far unsuccessful efforts to become profitable.

Now what: Apple doesn't need iRadio to be a profit-spinner -- it simply needs to be another lure for potential iPhone (and iPad and iPod) buyers. Apple can easily annihilate Pandora's path to profitability as it signs labels to deals that will likely become the "new normal" for streaming radio. As a free service lacking the premium content options offered on satellite radio, Pandora's only real competitive advantage is in the sheer bulk of its music library. No label or artist is going to want to give Pandora access for a 4% cut if they can get double that rate elsewhere.

Fool contributor Alex Planes holds no financial position in any company mentioned here. Add him on Google+ or follow him on Twitter @TMFBiggles for more insight into markets, history, and technology.

The Motley Fool recommends Apple. The Motley Fool owns shares of Apple. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.