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Pandora (NYSE: P) needs a better sustain pedal. Shares of the music discovery service opened 16% lower -- and went on to trade more than 20% lower -- after a Wall Street Journal article detailed Apple's (Nasdaq: AAPL) plan to roll out a competing service.

As "people familiar with the matter" told the financial daily, Apple's talking to its major label partners for licensing rights to offer a custom-radio service where virtual stations are populated based on user song or artist suggestions.

Yes, this sounds just like Pandora. And the new service that Spotify recently added. And the iHeartRadio upgrade that kicked in last fall. And what Sirius XM Radio (Nasdaq: AAPL) plans to introduce later this year to enhance the value of its Web-based subscriptions.

Why should Pandora be afraid of Apple?

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This isn't an easy business. Pandora darts in and out of profitability, and that's with an established base of 54.9 million users -- and growing -- who stream more than 1.1 billion hours of music and comedy a month.

However, Apple isn't likely to be approaching this as a profit center. Apple just wants to wrestle away the market share that Google's (Nasdaq: GOOG) Android is gobbling up in smartphones. The iPhone is where profit margins come to party, but open-source Android is becoming the global standard in mobile operating systems. Trend tracker Gartner reports that Android's share of the global smartphone market has grown from 43.4% to 64.1% over the past year.

If Apple can make its music service irresistible, it may win over Android fans, and then -- wait. What's that? The Journal's hearing that Apple won't be offering this copycat service on Android devices? It'll be only for iOS devices as well as Macs and PCs?

Oh, brother.

Ping me when you figure it out
Do you think iTunes would've gained traction a decade ago if it was limited to Apple users? It probably wouldn't have been much of a market-shaping force if it didn't roll out to Microsoft (Nasdaq: MSFT) users because Windows was the PC platform of choice. Why ignore Android?

The PC is dead. The sale of digital music is also at a tipping point. Apple may have done the right thing by sticking to outright sales as Napster, Rhapsody, and Microsoft's Zune Pass meandered, but Pandora and Spotify have genuinely changed the way that mobile users consume digital music.

There's nothing wrong with being fashionably late, but Apple is no longer the digital-music tastemaker it used to be. Anyone here still using Ping?

Apple figured it could take on the social-networking craze by layering sharing and broadcasting elements to its iTunes Music Store. Ping was born two summers ago, but it pretty much died then, too. Ping is a rare Apple whiff on this side of the millennium.

It's more likely that Appledora -- that's what I'll call Apple's Pandora clone until it becomes official -- will be more like Ping than the App Store. Sure, Apple can jam it into an upcoming iOS update so it's populated in all iPhones, iPads, and iPods, but that doesn't mean it will be any better than Pandora. It certainly won't be any more popular.

In the end, since the product isn't likely to be any better than the established free alternatives that are available across all devices, isn't Apple just wasting its time? Apple's history for user interfaces that "just work" is a great thing, but you don't hear too many people complaining about Pandora or Spotify as something that needs fixing.

Apple is a great company with great products, but there's no reason Pandora should have shed nearly a fifth of its value on vaporware that's flawed from the start.

Streaming out loud
A new premium report on Apple details the opportunities and challenges in store for its shareholders. It's also been updated to include new iPhone 5 details! Check it out now.