Lots of changes happening in the world of Apple audio content. iTunes Store sales have been declining for quite a while versus App Store sales and that discrepancy is being described as due to a decline in digital music sales. Apple's most recent quarterly report describes the situation a bit differently but also points to declining digital music sales. This decline is one reason given for Apple's interest in Beats. Yet it seems rather separate from the expansion of content on iTunes Radio. Apple's Declining Digital Music Sales Last week Katy Huberty of Morgan Stanley reiterated her Overweight rating of...

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