One major sign that a sector is heating up is the quantity and quality of the deal making, as rivals jockey for position. By that, and almost any other measure, streaming music is on fire; and today's announcement that Sony Music Limited will shut down to be replaced by a new partnership with Spotify is a major win for the pre-IPO startup. Sony Network Entertainment and Spotify today announced a global partnership to deliver digital music to the PlayStation Network's 64 million active users. Under the deal, Sony will shutter its own Music Unlimited service this Spring, and launch PlayStation...

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