Shares of Amazon (AMZN - Get Report) were higher Wednesday as it launches its new paid music streaming service. Amazon Music Unlimited is joining the increasingly crowded field and will compete against Apple (AAPL - Get Report) Music and Spotify. Amazon's service will cost $7.99 a month for members of Amazon's Prime loyalty program. Non-Prime members will pay $9.99 a month, while owners of Amazon's Echo will be able to get the service for $3.99 a month. 

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