Music Streaming Wars: Top 8 Contenders

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It's official: Apple is in the streaming music business. The company unveiled its much-anticipated streaming music service Monday at its Worldwide Developers Conference in San Francisco.

Dubbed iTunes Radio, the service debuts this fall. It's likely to be a game-changer in a crowded industry that thus far has crowned no clear winner.

Here's a look at the leading contenders vying to win the streaming wars.--Jill Krasny