A year ago this week, Apple (AAPL) CEO Steve Jobs introduced an online music store that promised to make buying and playing digital music on portable devices like Apple's iPod less cumbersome.
It wasn't exactly a revolutionary idea, but it had a profound effect. Many thought legitimate services couldn't compete with free, unlicensed services like Kazaa. But Apple has sold 50 million songs and helped spawn an array of me-too services from Wal-Mart, Musicmatch and a revived Napster
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