It seems like every few months, one of the major players in online music services—Amazon, Apple, Google, Microsoft, Spotify, and so on—will announce new features aimed at catching up to, or leapfrogging, the competition. Today, its Amazon’s turn: The online retailer and cloud services purveyor announced a significant update to its Cloud Player that adds music “scan and match” functionality, similar to Apple’s iTunes Match, to the service....
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